Area Of Circles

 $Area\ =\ \pi r^2$  Find the area of the circle. Radius = 5 cm.

• 31.5

• 78.5

• 154.5

 $Area\ =\ \pi r^2$  Find the area of the circle. Radius = 12 cm

• 75.36

• 113.04

• 452.16

 $Area\ =\ \pi r^2$   Find the area of the circle. DIAMETER = 20.  Remember: We need to use the radius to find the area.

• 314

• 1256

• 125.6

• 62.8

 $Area\ =\ \pi r^2$  Find the area of the circle.  DIAMETER = 18 in.  Remember - To find the area we need the radius.

• 56.52

• 113.04

• 254.34

• 1017.36

 $Circumference\ =2\pi r$  

Find the RADIUS of the circle. Circumference = 20. Round your answer to 1 decimal place.

• 9.6

• 6.4

• 3.2

• 12.8

 $Circumference\ =\ 2\pi r$  

Find the RADIUS of the circle. The circumference = 100. Round your answer to 1 decimal place.

• 12.6

• 15.9

• 16.5

• 18.1

 $Circumference\ =\ 2\pi r$  

Find the DIAMETER. Circumference = 40. Round your answer to 1 decimal place.  REMEMBER - Diameter is twice as big as the radius.

• 12.8

• 6.4

• 25.6

• 19.4

 $Circumference\ =\ 2\pi r$  

Find the DIAMETER of the circle. Circumference = 31.4 cm. Round your answer to 1 decimal place.  REMEMBER - Diameter is twice as big as the radius.

• 20

• 15

• 10

• 5

 $C\ =\ 2\pi r$   $A\ =\pi r^2$  Find the AREA of the circle. The circumference is 100 meters. Remember: Always find the radius first. Round all of your answers to 1 decimal place.

• 214.7

• 458.1

• 793.8

 $A=\pi r^2$   $C=2\pi r$  

The CIRCUMFERENCE of the circle is 18 inches. Find the AREA of the circle. Round all answers to 1 decimal place.  REMEMBER - Always find the radius first.

• 26.4

• 44.7

• 72.5