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Lesson 3

1. Lesson 3

1.8. Explore 4

Mathematics 20-3 Module 6

Module 6: Surface Area

 

Self-Check 2
  1. A conical paper cup has a slant height of 10 cm. The amount of paper needed to manufacture this cup depends on its surface area, which is 110 cm2. To the nearest tenth of a cm, calculate the radius of the paper cup. Answer

    This is an image of a conical shaped paper cup.
    iStockphoto/Thinkstock


textbook
  1. Turn to page 135 of “Extend Your Thinking” in MathWorks 11, and do question 6. Answer
The cup has an open top, so you will need to adjust the formula for the surface area of a cone.

glossary

It is now time to add new math terms to Mathematics 20-3: Glossary Terms.


In this lesson the new term you will add is

  • sphere

formula sheet
At this time, you may want to add the surface area formulas for a sphere, cone, cylinder, rectangular prism, and cube to your Formula Sheet. You will be referring to these formulas throughout the module.