Area, Circumference and Surface Area

Diameter 13.5 in
Find the circumference of the circle.

• 84.79 in

• 42.39 in

• 21.195 in

• 572.265 in 

What formula is this used for:
πr²

• Circumference 

• Area

• Surface Area

• Volume

What formula is this used for:
πd

• Area

• Circumference 

• Surface Area

• Volume 

Diameter 32 inches
What is the radius?

• 16 inches

• 64 inches

• 96 inches
  96 inches

• 16 ft 

What formula is used to find the space 
"inside" a flat object?

• Circumference 

• Surface Area

• Area

• Volume

What formula is used to find the distance around a circle?

• Area

• Surface area

• Circumference

• Volume

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

A bicycle tire has a diameter of 20 inches. How many inches is one full revolution of the wheel?  

• 31.4 in

• 1256 in

• 125.6 in

• 62.8 in

A circle pool has a radius of 7.5 ft. Monica wants to know how many ft of a pool cover she needs to buy?

• 23.55 ft²

• 176.63 ft²

• 47.1 ft²

• 706.5 ft²