Week 19 day 4 6 A school increases the width of its rectangular playground from 25 meters to 40 meters and the length from 45 meters to 60 meters. By how much does the perimeter of the playground increase? 30 meters 60 meters 200 meters 225 meters A B C D

You will find the area of a parallelogram, a triangle, and a composite figure.

Theorem 10-1 The area of a rectangle is the product of its base and height. Area of a Rectangle A = bh h b

EXAMPLE: Find the area for the following rectangle: 4 9 A = bh A = 9  4 A = 36

Theorem 10-2 The area of a parallelogram is the product of the base and the corresponding height. Area of a Parallelogram A = bh b h

EXAMPLE: Find the area for the following parallelogram A = bh 5 in. 4.5 in. 4 in. A = 5 in.  4 in. A = 20 in. 2

Theorem 10-3 The area of a triangle is half the product of a base and the corresponding height. Area of a Triangle A = 1 / 2 bh b h

EXAMPLE: Find the area for the following triangle: A = 1 / 2 bh A = 1 / 2 ·7 m  3 m A = 10.5 m 2 5 m 3 m 2 m

Assignment

Assignment Workbook Page 439 all