Area and Circumference Review

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

• Area

• Surface area

• Circumference

• Volume

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

Trevor is making a tablecloth for a circular table with a diameter of 40 inches. How many inches of tablecloth does he need? 

• 125.6 in²

• 251.2 in²

• 1256 ft²

• 1256 in²

Ray wants to build a fence around his circular garden outside. The garden has a radius of 6 ft. How many feet of fencing does he need?

• 37.68 ft

• 18.84 ft

• 113.04 ft

• 452.16 ft

How much cement would be needed to cover this circular parking lot?

• 1385.44 square feet

• 2142.12 square feet

• 5541.77 square feet

• 1289.12 square feet

If you have the circumference of a circle is 149 ft., what is the radius of that circle?

• 47.45 ft

• 23.7 ft.

• 74.5 ft.

• None of the above

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 11.32 ft

• 12.25 ft

• 10.99 ft

• 8.75 ft

what is the formula for finding area of a circle

• C = π r²

• A = π r²

• A = π r² / 2

• C = 2 π r

what is the formula for finding the area of a semi-circle

• A = π r²

• C = π r²

• A = π r² / 2

• A = 2 π r

How much orange paint is needed to paint the entire circle?

• 50.27 sq. cm.

• 78.23 sq. cm.

• 98.12 sq. cm.

• 201.06 sq. cm.