Circumference and area

12

A circle has a circumference of 12π. What is its diameter?

24

A circle has a circumference of 24π. What is its diameter?

12

A circle has a circumference of 24π. What is its radius?

157.08

A circle has a diameter of 50 units. What is the circumference to the nearest hundredth?

314.2

A circle has a radius of 50 units. What is the circumference to the nearest tenth?

18.8

A toy train travels around a Christmas tree in a circle. The train track measures 6 feet in diameter. What is the distance (in feet) that the train travels to the nearest tenth?

25.13

A tree is sold based on the circumference of the tree. If a tree has a radius of 4 inches, then what is the circumference (in feet) of the tree to the nearest hundredth?

34.54

Find the circumference of a circle with a diameter of 11. Use 3.14 for pi

28π

Find the circumference of a circle with a diameter of 28 in. in terms of pi

18.85

Find the circumference of a circle with a radius of 3 miles to the nearest hundredth

8π

Find the circumference of a circle with a radius of 4 in terms of pi.

12.57

Green Reservoir is in the shape of a circle. If the distance across the reservoir is 4 miles, what is the circumference to the nearest hundredth?

pi

On ANY circle, the (Circumference ÷ Diameter) = ______

78.5

The diameter is 10. What is the area of this circle? Use 3.14 for pi.

200.96

The diameter is 16. What is the area of this circle? Use 3.14 for pi.

55.4

The diameter is 8.4. What is the area of this circle? Round your answer to the nearest tenth.

circumference

The distance around a circle. Also known as the perimeter of a circle.

diameter

The distance shown is called the ________.

radius

The distance shown is called the ________.

445

The radius is 11.9. What is the area of this circle? Round your answer to the nearest whole number.

4.41π

The radius is 2.1. What is the area of this circle in terms of pi?

50.2

The radius is 4. What is the area of this circle? Round your answer to the nearest tenth. Use 3.14 for pi.

105.7

The radius is 5.8. What is the area of this circle? Round your answer to the nearest tenth.

49π

The radius is 7. What is the area of this circle in terms of pi?

81π

The radius is 9. What is the area of this circle in terms of pi?

3.14 = circumference/diameter

What is the relationship between the circumference and diameter?