Circle Basics

What is circumference?

• The area of the circle

• The distance across the circle

• The perimeter of the circle

• The distance to the middle of the circle

What is the area of the circle? Round to the nearest tenth if needed.

• 49

• 153.9

• 153.8

• 7

What is the proper formula to use in order to find the area of a circle?

• A=πr²

• A=r²

• A=πd²

• A=d²

Find the area of the circle. Round to the nearest hundredth if needed.

• 113.04

• 133.04

• 36

• 133.1

Find the circumference and area of the circle. C= circumference, A= area. Round to the nearest hundredth if needed.

• C=31.4, A=78.5

• C= 314, A=78.5

• C=33.4, A=153.86

• C=3.14, A=5

Which formulas can you use to find circumference of a circle? Choose two answers.

• C=πd

• C=d²

• C=2πr

• C=πr²

The circumference of the circle is 56.52 ft². What is the diameter of the circle?

• 19

• 20

• 18

• 19.5

Find the area of the half circle.

• 78.5

• 39.25

• 75.6

• 38.6

Find the circumference of the circle. Round to the nearest hundredth if needed.

• 13.51

• 13.50

• 14

• 13

Calculate the diameter of a circle if its circumference is 25 . 1 cm.

• d=25.1 cm

• d=3.99 cm

• d=7.99 cm

• d=3.14 cm