Circle Homework

What formula is this used for:
πr²

• Circumference 
• Area
• Surface Area
• Volume

Radius 6 cm
What is the diameter? 

• 36 cm
• 12 cm
• 6 cm
• 3 cm 

Diameter 32 inches
What is the radius?

• 16 inches
• 64 inches
• 96 inches

• 24 inches

Radius 5 in
Find the area of the circle.

• 15.7 inches²
• 31.4 inches²
• 314 inches²
• 78.5 inches²

Diameter 14 inches
Find the area of a circle.

• 615.44 in²
• 153.86 in²
• 43.96 in²
• 87.92 in²

Radius 4 inches
Find the circumference of the circle. 

• 25.12 in
• 12.56 in
• 50.24 in
• 200.96 in

Diameter 13.5 in
Find the circumference of the circle.

• 84.79 in
• 42.39 in
• 21.195 in
• 572.265 in 

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

The radius of the circle is 9 meters.  What is the circle's circumference?

• 9 meters
• 28.26 meters
• 56.52 meters
• 18 meters