Just like with surface area in Lesson 2.1, you can determine an unknown dimension when given the volume and the other dimensions of an object.

The Warm Up at the beginning of this Lesson focused your attention on solving equations involving square roots and cube roots to review your algebra skills. You may wish to go back to the Warm Up before moving forward.

 

Example 3

Determine the length, to the nearest metre, of the right rectangular pyramid. 

 «math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«msub mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»V«/mi»«mrow»«mi»r«/mi»«mi»i«/mi»«mi»g«/mi»«mi»h«/mi»«mi»t«/mi»«mo»§#160;«/mo»«mi»p«/mi»«mi»y«/mi»«mi»r«/mi»«mi»a«/mi»«mi»m«/mi»«mi»i«/mi»«mi»d«/mi»«/mrow»«/msub»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mn mathcolor=¨#B94A48¨»6«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mn mathcolor=¨#B94A48¨»048«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mn»3«/mn»«/msup»«mspace linebreak=¨newline¨/»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathcolor=¨#B94A48¨»w«/mi»«mo mathcolor=¨#B94A48¨»=«/mo»«mn mathcolor=¨#B94A48¨»24«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mspace linebreak=¨newline¨/»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathcolor=¨#B94A48¨»h«/mi»«mo mathcolor=¨#B94A48¨»=«/mo»«mn mathcolor=¨#B94A48¨»28«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«/mrow»«/mstyle»«/math»  «math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«msub mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»V«/mi»«mrow»«mi»r«/mi»«mi»i«/mi»«mi»g«/mi»«mi»h«/mi»«mi»t«/mi»«mo»§#160;«/mo»«mi»p«/mi»«mi»y«/mi»«mi»r«/mi»«mi»a«/mi»«mi»m«/mi»«mi»i«/mi»«mi»d«/mi»«/mrow»«/msub»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mfrac mathcolor=¨#B94A48¨»«mn»1«/mn»«mn»3«/mn»«/mfrac»«mi mathcolor=¨#B94A48¨»l«/mi»«mi mathcolor=¨#B94A48¨»w«/mi»«mi mathcolor=¨#B94A48¨»h«/mi»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»6«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mn mathcolor=¨#B94A48¨»048«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mn»3«/mn»«/msup»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mfrac mathcolor=¨#B94A48¨»«mn»1«/mn»«mn»3«/mn»«/mfrac»«mi mathcolor=¨#B94A48¨»l«/mi»«mo mathcolor=¨#B94A48¨»(«/mo»«mn mathcolor=¨#B94A48¨»24«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mo mathcolor=¨#B94A48¨»)«/mo»«mo mathcolor=¨#B94A48¨»(«/mo»«mn mathcolor=¨#B94A48¨»28«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mo mathcolor=¨#B94A48¨»)«/mo»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»6«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mn mathcolor=¨#B94A48¨»048«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mn»3«/mn»«/msup»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mfrac mathcolor=¨#B94A48¨»«mn»1«/mn»«mn»3«/mn»«/mfrac»«mi mathcolor=¨#B94A48¨»l«/mi»«mo mathcolor=¨#B94A48¨»(«/mo»«mn mathcolor=¨#B94A48¨»672«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mn»2«/mn»«/msup»«mo mathcolor=¨#B94A48¨»)«/mo»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»6«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mn mathcolor=¨#B94A48¨»048«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mn»3«/mn»«/msup»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mfrac mathcolor=¨#B94A48¨»«mn»1«/mn»«mn»3«/mn»«/mfrac»«mo mathcolor=¨#B94A48¨»(«/mo»«mn mathcolor=¨#B94A48¨»672«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mn»2«/mn»«/msup»«mo mathcolor=¨#B94A48¨»)«/mo»«mi mathcolor=¨#B94A48¨»l«/mi»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»6«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mn mathcolor=¨#B94A48¨»048«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mn»3«/mn»«/msup»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mfenced mathcolor=¨#B94A48¨»«mfrac»«mrow»«mn»672«/mn»«mo»§#160;«/mo»«msup»«mi mathvariant=¨normal¨»m«/mi»«mn»2«/mn»«/msup»«/mrow»«mn»3«/mn»«/mfrac»«/mfenced»«mi mathcolor=¨#B94A48¨»l«/mi»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»6«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mn mathcolor=¨#B94A48¨»048«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mn»3«/mn»«/msup»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mfenced mathcolor=¨#B94A48¨»«mrow»«mn»224«/mn»«mo»§#160;«/mo»«msup»«mi mathvariant=¨normal¨»m«/mi»«mn»2«/mn»«/msup»«/mrow»«/mfenced»«mi mathcolor=¨#B94A48¨»l«/mi»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mfrac mathcolor=¨#B94A48¨»«mrow»«mn»6«/mn»«mo»§#160;«/mo»«mn»048«/mn»«mo»§#160;«/mo»«msup»«mi mathvariant=¨normal¨»m«/mi»«mn»3«/mn»«/msup»«/mrow»«mrow»«mn»224«/mn»«mo»§#160;«/mo»«msup»«mi mathvariant=¨normal¨»m«/mi»«mn»2«/mn»«/msup»«/mrow»«/mfrac»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mfrac mathcolor=¨#B94A48¨»«menclose notation=¨updiagonalstrike¨»«mn»224«/mn»«mo»§#160;«/mo»«msup»«mi mathvariant=¨normal¨»m«/mi»«mn»2«/mn»«/msup»«/menclose»«menclose notation=¨updiagonalstrike¨»«mn»224«/mn»«mo»§#160;«/mo»«msup»«mi mathvariant=¨normal¨»m«/mi»«mn»2«/mn»«/msup»«/menclose»«/mfrac»«mo mathcolor=¨#B94A48¨»§#183;«/mo»«mi mathcolor=¨#B94A48¨»l«/mi»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»27«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathvariant=¨normal¨ mathcolor=¨#B94A48¨»m«/mi»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mi mathcolor=¨#B94A48¨»l«/mi»«/mrow»«/mstyle»«/math»

The length of the right rectangular pyramid is 27 m.

 

Example 4

Determine the radius of the right cone.

 «math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«msub mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»V«/mi»«mrow»«mi»r«/mi»«mi»i«/mi»«mi»g«/mi»«mi»h«/mi»«mi»t«/mi»«mo»§#160;«/mo»«mi»c«/mi»«mi»o«/mi»«mi»n«/mi»«mi»e«/mi»«/mrow»«/msub»«mo mathcolor=¨#B94A48¨»=«/mo»«mn mathcolor=¨#B94A48¨»382«/mn»«mo mathcolor=¨#B94A48¨».«/mo»«mn mathcolor=¨#B94A48¨»7«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»cm«/mi»«mn»3«/mn»«/msup»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mi mathcolor=¨#B94A48¨»h«/mi»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»=«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mn mathcolor=¨#B94A48¨»15«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathcolor=¨#B94A48¨»cm«/mi»«/mrow»«/mstyle»«/math»
 «math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«msub mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»V«/mi»«mrow»«mi»r«/mi»«mi»i«/mi»«mi»g«/mi»«mi»h«/mi»«mi»t«/mi»«mo»§#160;«/mo»«mi»c«/mi»«mi»o«/mi»«mi»n«/mi»«mi»e«/mi»«/mrow»«/msub»«mo mathcolor=¨#B94A48¨»=«/mo»«mfrac mathcolor=¨#B94A48¨»«mn»1«/mn»«mn»3«/mn»«/mfrac»«mi mathcolor=¨#B94A48¨»§#960;«/mi»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»r«/mi»«mn»2«/mn»«/msup»«mi mathcolor=¨#B94A48¨»h«/mi»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»382«/mn»«mo mathcolor=¨#B94A48¨».«/mo»«mn mathcolor=¨#B94A48¨»7«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»cm«/mi»«mn»3«/mn»«/msup»«mo mathcolor=¨#B94A48¨»=«/mo»«mfrac mathcolor=¨#B94A48¨»«mn»1«/mn»«mn»3«/mn»«/mfrac»«mi mathcolor=¨#B94A48¨»§#960;«/mi»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»r«/mi»«mn»2«/mn»«/msup»«mo mathcolor=¨#B94A48¨»(«/mo»«mn mathcolor=¨#B94A48¨»15«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathcolor=¨#B94A48¨»cm«/mi»«mo mathcolor=¨#B94A48¨»)«/mo»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»382«/mn»«mo mathcolor=¨#B94A48¨».«/mo»«mn mathcolor=¨#B94A48¨»7«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»cm«/mi»«mn»3«/mn»«/msup»«mo mathcolor=¨#B94A48¨»=«/mo»«mfrac mathcolor=¨#B94A48¨»«mrow»«mn»15«/mn»«mo»§#160;«/mo»«mi»cm«/mi»«/mrow»«mn»3«/mn»«/mfrac»«mi mathcolor=¨#B94A48¨»§#960;«/mi»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»r«/mi»«mn»2«/mn»«/msup»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»382«/mn»«mo mathcolor=¨#B94A48¨».«/mo»«mn mathcolor=¨#B94A48¨»7«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»cm«/mi»«mn»3«/mn»«/msup»«mo mathcolor=¨#B94A48¨»=«/mo»«mo mathcolor=¨#B94A48¨»(«/mo»«mn mathcolor=¨#B94A48¨»5«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathcolor=¨#B94A48¨»cm«/mi»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mo mathcolor=¨#B94A48¨»§#183;«/mo»«mi mathcolor=¨#B94A48¨»§#960;«/mi»«mo mathcolor=¨#B94A48¨»)«/mo»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»r«/mi»«mn»2«/mn»«/msup»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mfrac mathcolor=¨#B94A48¨»«mrow»«mn»382«/mn»«mo».«/mo»«mn»7«/mn»«mo»§#160;«/mo»«msup»«mi»cm«/mi»«mn»3«/mn»«/msup»«/mrow»«mrow»«mn»5«/mn»«mo»§#160;«/mo»«mi»cm«/mi»«mo»§#160;«/mo»«mo»§#183;«/mo»«mi»§#960;«/mi»«/mrow»«/mfrac»«mo mathcolor=¨#B94A48¨»=«/mo»«mfenced mathcolor=¨#B94A48¨»«mfrac»«menclose notation=¨updiagonalstrike¨»«mn»5«/mn»«mo»§#160;«/mo»«mi»cm«/mi»«mo»§#160;«/mo»«mo»§#183;«/mo»«mi»§#960;«/mi»«/menclose»«menclose notation=¨updiagonalstrike¨»«mn»5«/mn»«mo»§#160;«/mo»«mi»cm«/mi»«mo»§#160;«/mo»«mo»§#183;«/mo»«mi»§#960;«/mi»«/menclose»«/mfrac»«/mfenced»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»r«/mi»«mn»2«/mn»«/msup»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»24«/mn»«mo mathcolor=¨#B94A48¨».«/mo»«mn mathcolor=¨#B94A48¨»363«/mn»«mo mathcolor=¨#B94A48¨».«/mo»«mo mathcolor=¨#B94A48¨».«/mo»«mo mathcolor=¨#B94A48¨».«/mo»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»cm«/mi»«mn»2«/mn»«/msup»«mo mathcolor=¨#B94A48¨»=«/mo»«msup mathcolor=¨#B94A48¨»«mi mathcolor=¨#B94A48¨»r«/mi»«mn»2«/mn»«/msup»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«msqrt mathcolor=¨#B94A48¨»«mn»24«/mn»«mo».«/mo»«mn»363«/mn»«mo».«/mo»«mo».«/mo»«mo».«/mo»«mo»§#160;«/mo»«msup»«mi»cm«/mi»«mn»2«/mn»«/msup»«/msqrt»«mo mathcolor=¨#B94A48¨»=«/mo»«msqrt mathcolor=¨#B94A48¨»«msup»«mi»r«/mi»«mn»2«/mn»«/msup»«/msqrt»«/mrow»«/mstyle»«/math»
«math style=¨font-family:`Times New Roman`¨ xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨16px¨»«mrow»«mn mathcolor=¨#B94A48¨»4«/mn»«mo mathcolor=¨#B94A48¨».«/mo»«mn mathcolor=¨#B94A48¨»9«/mn»«mo mathcolor=¨#B94A48¨»§#160;«/mo»«mi mathcolor=¨#B94A48¨»cm«/mi»«mo mathcolor=¨#B94A48¨»§#8773;«/mo»«mi mathcolor=¨#B94A48¨»r«/mi»«/mrow»«/mstyle»«/math»

The radius of the right cone is approximately 4.9 cm.