1. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-1 Chapter 1 Section 9-3 Perimeter, Area, and Circumference

2. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-2 Perimeter, Area, and Circumference Perimeter of a Polygon Area of a Polygon Circumference of a Circle Area of a Circle

3. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-3 Perimeter of a Polygon The perimeter of any polygon is

4. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-4 Perimeter of a Triangle The perimeter P of a triangle with sides of lengths a, b, and c is given by the formula

5. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-5 Perimeter of a Rectangle The perimeter P of a rectangle with length l and width w is given by the formula

6. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-6 Perimeter of a Square The perimeter P of a square with all sides of length s is given by the formula.

7. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-7 Area of a Polygon The amount of plane surface covered by a polygon is called its

8. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-8 Area of a Rectangle The area A of a rectangle with length l and width w is given by the formula

9. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-9 Example: Rectangle Find the perimeter and area of the rectangle below. 7 ft. 15 ft. Solution

10. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-10 Area of a Square The area A of a square with all sides of length s is given by the formula

11. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-11 Area of a Parallelogram The area A of a parallelogram with height h and base b is given by the formula

12. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-12 Area of a Trapezoid The area A of a trapezoid with parallel bases b and B and height h is given by the formula

13. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-13 Example: Area of a Parallelogram Find the area of the trapezoid below. Solution 13 cm. 5 cm. 7 cm.

14. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-14 Area of a Triangle The area A of a triangle with base b and height h is given by the formula

15. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-15 Example: Area With Multiple Shapes Find the area of the shaded region below. Solution 4 in.

16. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-16 Circumference of a Circle

17. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-17 Area of a Circle The area A of a circle with radius r is given by the formula.

18. © 2008 Pearson Addison-Wesley. All rights reserved 9-3-18 Example: Circle Find the area and circumference of a circle with a radius that is 6 inches long (use 3.14 as an approximation for pi). Solution