1. Do Now 4/16/13 Copy HW in your planner. Copy HW in your planner.  Text p. 362, #1-24 all, 27, 32, 33 In your notebook, define in your own words the following terms: circumference, radius, diameter, center, and perimeter. In your notebook, define in your own words the following terms: circumference, radius, diameter, center, and perimeter. Be ready to finish Cumulative Test Chapters 1-8 from yesterday. Be ready to finish Cumulative Test Chapters 1-8 from yesterday.

2. Objective SWBAT find the perimeter of a polygon and the circumference of a circle.

3. Section 9.1 “Perimeter and Circumference” the distance around a geometric figure Perimeter the distance around a circle Circumference

4. To find the perimeter P of a polygon, you can add the lengths of its sides. Perimeter 25 cm 15 cm P = 25 + 25 + 15 P = 65 cm 14 ft 18 ft P = 2l + 2w P = (2 · 18) + (2 ·14) P = 36 + 28 P = 64 ft 8 m 12 m 9 m 6 m 10 m P = 9 + 12 + 8 + 10 + 6 P = 45 m

5. To find the circumference of a circle, multiply the diameter by pi ( ). Circumference = d Circumference = d Circumference = 2 r Circumference = 2 r Circumference Radius Diameter Circumference Circumference

6. Try It Out!! Find the circumference of the following circles.  A). 4 m 3 m B).

7. Working with Circumference Lily is drawing plans for a circular fountain. The circumference of the fountain is 63 ft. What is the approximate diameter?

8. Find the distance around the figure. 15 m 35 m Break the figures apart into simple shapes: circles, rectangles, squares, or triangles. Find the distance around each part. Distance around semi-circles Distance around “outside sides” of rectangle 35 m + 35 m Total 35 m + 35 m + 47.1 m 117.1 m

9. Find the distance around the figure. 8 ft Break the figures apart into simple shapes: circles, rectangles, squares, or triangles. Find the distance around each part. Distance around semi-circle Distance around “outside sides” of square 8 ft + 8 ft Total 8 ft + 8 ft + 12.56 ft 44.56 ft Distance around “outside sides” of triangle 8 ft + 8 ft

10. The foul poles down the 1 st and 3 rd base lines on a baseball field are 250 feet from home plate. Find the distance around the outside of the field. Break the figures apart into simple shapes: circles, rectangles, squares, or triangles. Find the distance around each part. Total 250 ft + 250 ft + 392.5 ft 892.5 ft Distance around quarter-circle 1 st & 3 rd base foul lines 250 ft + 250 ft

11. Homework Text p. 362, #1-24 all, 27, 32, 33 Text p. 362, #1-24 all, 27, 32, 33 24