1. Section 10.21 aFind the area of a rectangle and a square. bFind the area of a parallelogram, a triangle, and a trapezoid. cSolve applied problems involving areas of rectangles, squares, parallelograms, triangles, and trapezoids. Area of a Rectangle The area of a rectangle is the product of the length l and the width w: A = l  w l l w w Exampl e Find the area of a rectangle that is 9 yd by 5 yd.

2. Section 10.22 Area of a Square The area of a square is the square of the length of a side: A = s  s, or A = s 2 s s s s Example Find the area of a square with sides of length 14.8 m.

3. Section 10.23

4. 4

5. 5 Area of a Triangle The area A of a triangle is half the length of the base b times the height h: b h Example Find the area of this triangle. 6 cm cm

6. Section 10.26 Example Find the area of this trapezoid. 8 cm8 cm 14 cm14 cm 20 cm20 cm 8 cm 14 cm 20 cm

7. Section 10.27 Homework: Problems 35, 37, 39, 41 – 4 step process. Problem 45 – start with the formula.