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

Find the area of a circle with a radius of 35.

• 11

• 222

• 154

• 220

Find the area of a circle with a diameter of 42.

• 100

• 132

• 60

• 21

Find the radius of a circle with a diameter of 42.

• 21

• 5

• 3

• 2

What is the area of this circle?

• 62.59 cm²
• 113.1 cm²
• 19.81 cm²
• 28.26 cm²

What is the area of this circle?

• 82.13 m²
• 78.50 m²
• 314.16 m²
• 170.12 m²

What is the radius of this circle?

• 12
• 6
• 24

What is the radius of this circle?

• 20
• 10
• 40