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Lesson 6

1. Lesson 6

1.2. Refresher

Mathematics 20-2 Module 6 Lesson 6

Module 6: Proportional Reasoning

 

Refresher
 

How did you do? Did you remember how to find the area of basic shapes? Great work, if you remembered! If you did not, carefully read this Refresher section.



m20_2_formula.jpg

The following table shows the formulas for some basic shapes. If you haven’t done so already, you should add these to your formula sheet. You are not expected to memorize these formulas, but you do need to be familiar with them.

 

Area Formulas

Shape

Formula

triangle

 

This is an illustration of a triangle. The area of a triangle is one-half base times height.

m6_eqn023.eps

rectangle

 

This is an illustration of a rectangle. The area of a rectangle is length times width.

m6_eqn024.eps

square

 

This is an illustration of a square. The area of a square is the length of a side squared.

m6_eqn025.eps

parallelogram

 

This is an illustration of a parallelogram. The area of a parallelogram is base times height.

m6_eqn026.eps

trapezoid

 

This is an illustration of a trapezoid. The area of a trapezoid is one-half height times the sum of the two side lengths.

m6_eqn027.eps

circle

 

This is an illustration of a circle. The area of a circle is pi multiplied by the radius squared.

m6_eqn028.eps

Adapted from: CANAVAN-MCGRATH ET AL. Principles of Mathematics 11,
© 2012 Nelson Education Limited. p. 475. Reproduced by permission.

 

The Mathematics Glossary defines the term area. The glossary contains an interactive Demonstration Applet and Flash animations to illustrate the definition.

 

 

This is a screenshot for the Demonstration Applet at Area.

 

Go to “Area Formulas.” This review of using formulas to find area for rectangles, squares, triangles, and parallelograms presents formulas solutions and some practice questions.

 

 

This is a screenshot for “Area Formulas.”



m20_2_search.jpg

For additional review, you can also type the words “Math.com area of polygons and circles” into your favourite Internet search engine. You are looking for a website titled Math.com: The World of Math Online. You want Step 1: First Glance. There are a variety of resources available online to help you review and practice calculating the area of 2-D shapes.