1. Perimeter, Circumference and Area

2. Perimeter and Circumference Perimeter : The distance around a geometric figure. Circumference: The distance around a circle.

3. Perimeter To find perimeter add the lengths of all the sides. – Example: Find the perimeter of the polygon 8 in 6 in 8 in 6 in P = 8 + 8 + 6 + 6 P = 28 The perimeter is 28 in

4. Perimeter – Example : Find the perimeter of the triangle 12 in 16 in P = 12 + 12 + 16 P = 40 The perimeter is 40 in

5. Circumference To find the circumference multiply times diameter, where is 3.14 C = d Diameter

6. Circumference Example: Find the circumference Diameter = 8 in Circumference = d C = 3.14(8) C = 25.12 The circumference is 25.12 in

7. Circumference Example: Find the circumference radius = 10 cm Circumference = d Diameter = 2r = 2 (10) = 20 C = 3.14(20) C = 62.8 The circumference is 62.8 in

8. Area of Rectangles The area of a rectangle is the product of its length and width. A = ω ω

9. Area of Rectangles Find the area of the rectangle 10 ft 7.5 in A = ω A = 10(7.5) A = 75 ft² The area is 75 ft²

10. Area of Triangles The area of a triangle is half the product of its base b and its height h. A = bh height base

11. Area of Triangles Example: Find the area of the triangle 6 in 5 in A = bh A = 5(6) A = 15 in ²

12. Area of Circles The area of a circle is the product of and the square of the circle’s radius r. A = r² radius

13. Area of Circles Example: Find the area of the circle r = 3 m A = r² A = 3.14(3)² A = 3.14(9) A = 28.26 m ² The area of the circle is 28.26m ²

14. Area of Circles d = 8 in A = r² Diameter = 4 in A = 3.14(4)² A = 3.14(4) A = 50.24 in² The area of the circle is 50.24in²

15. Lets Review Perimeter = Sum of all sides Circumference = d Area of a Rectangle = ω Area of a Triangle = bh Area of a Circle = r²