1. Chapter 4 L4-5 Notes: Perimeter

2. Vocabulary The distance around any closed figure is called its perimeter. P for “Plus” all Sides

3. Perimeter Find the perimeter of the rectangle.

4. Perimeter Find the perimeter of the closed figure. 5 ft

5. Your Turn… Find the perimeter of each rectangle. 1. 2ft by 3 ft 2. 6.5 in. by 6.5 in 3. 5.75 mm. by 1.5 mm

6. L4-6 Notes Circumference

7. The circumference is the distance around a circle. The radius is the distance from the center to any point on a circle. The diameter is the distance across a circle through its center. The center is the center point of the circle.

8. Circumference The circumference of a circle is equal to π times its diameter. π (Greek) = 3.1415926… or 3.14 Formula: C = πd

9. Examples Find the circumference of the circles. 1.2. 6 in. 2.4 ft.

10. On You Own… Find the circumference of each circle. Round to the nearest tenth. 1. d = 15 cm 2. r = 4.5 yd