# Perimeter and Circumference of Circles

## Presentation on theme: "Perimeter and Circumference of Circles"— Presentation transcript:

Perimeter and Circumference of Circles
Word Problems Perimeter and Circumference of Circles

If the perimeter of a square is 60 inches, how long is each side?
Perimeter is the distance around an object. Square has 4 equal sides Divide the Perimeter by 4 Each side measures 15 in. P = 60 in.

If the perimeter of a square is 180 inches, how long is each side?
Perimeter is the distance around an object. Square has 4 equal sides Divide the Perimeter by 4 Each side measures 45 in. P = 180 in.

A rectangular piece of board is 57. 5 cm by 76. 3 cm
A rectangular piece of board is 57.5 cm by cm. What is the perimeter of the board? 76.3 cm 57.5 cm

A rectangular piece of bard is 62. 4 cm by 57. 3 cm
A rectangular piece of bard is 62.4 cm by cm. What is the perimeter of the board? 62.4 cm 57.3 cm

First – find the Perimeter.
5. A wooden fence is to be built around a 22m by 48m lot. How many meters of fencing will be needed? If the wood for the fence costs \$25.00 per meter, what will the wood for the fence cost? Two things to do here! First – find the Perimeter. Now – multiply the Perimeter by the cost per meter.

First – find the Perimeter.
6. A wooden fence is to be built around a 46m by 70m lot. How many meters of fencing will be needed? If the wood for the fence costs \$22.50 per meter, what will the wood for the fence cost? Two things to do here! First – find the Perimeter. Now – multiply the Perimeter by the cost per meter.

7. The minute hand on a clock is 8cm long
7. The minute hand on a clock is 8cm long. What distance does the tip travel in one complete rotation, to the nearest centimeter. Hands are the radius Don’t forget to round

8. The hour hand on a clock is 6cm long
8. The hour hand on a clock is 6cm long. What distance does the tip travel in one complete rotation, to the nearest centimeter. Hands are the radius Don’t forget to round

6 5 so.. Fencing goes around a Perimeter.
9. Mario is fencing the area shown below. If all measurements are given in feet, how many feet of fencing will he need? Now ADD up everything On the outside !!! If this is 11 6 3 4 5 This is Half of A Circle Fencing goes around a Perimeter. First – find the measurements of the missing sides. 6 5 This side is 9 9 – 3 = 6 11 – 6 = 5 so..

9 3 so.. Fencing goes around a Perimeter.
10. Jeff is fencing the area shown below. If all measurements are given in feet, how many feet of fencing will he need? Now ADD up everything On the outside !!! If this is 10 7 2 4 This is Half of A Circle Fencing goes around a Perimeter. First – find the measurements of the missing sides. 9 3 This side is 11 11 – 2 = 9 10 – 7 = 3 so..

So, DIVIDE the circumference by pi.
11. The distance around Venus is about 38,013 km. What is the equatorial diameter of Venus? In this case, you are not looking for the circumference, but the diameter!! So, DIVIDE the circumference by pi.

So, DIVIDE the circumference by pi.
12. The distance around Mars is about 21,344 km. What is the equatorial diameter of Mars? In this case, you are not looking for the circumference, but the diameter!! So, DIVIDE the circumference by pi.