Math Antics Circle Area and Circumference

A Circle has a diameter of 10 centimeters.  What is the area of the circle? (Best Choice)

• 5π or about 15.7 cm²

• 10π or about 31.4 cm²

• 25π or about 78.5 cm²

• 100π or about 314 cm² 

A Circle has a diameter of 18 meters.  What is the circumference of the circle? (Best Choice)

• 9π or about 28.26 m

• 18π or about 56.52 m

• 81π or about 254.34m

• 324π or about 1017.36 m 

A Circle has a radius of 12 inches.  What is the circumference of the circle? (Best Choice)

• 24π or about 75.36 in

• 12π or about 37.68 in

• 144π or about 452.16 in

• 576π or about 1,808.64 in 

What is the area of the circle? (Best Choice)

• 24π or about 75.36 in²

• 12π or about 37.68 in²

• 144π or about 452.16 in²

• 576π or about 1,808.64 in² 

What is the area of the circle? (Best Choice)

• 9π or about 28.26 m²

• 18π or about 56.52 m²

• 81π or about 254.34m²

• 324π or about 1017.36 m² 

A circular window has a diameter of 24 inches.  What is the area of the glass in the window ? (Best Choice)

• 24π or about 75.36 in²

• 12π or about 37.68 in²

• 576π or about 1,808.64 in²

• 144π or about 452.16 in² 

A circular window has a diameter of 24 inches.  A piece of metal is to go around the window for a frame. How long does the metal need to be? (Best Choice)

• 24π or about 75.36 in

• 12π or about 37.68 

• 576π or about 1,808.64 in

• 144π or about 452.16 in 

A center circle on a basketball court has a diameter of 12 feet.  How long is the line that wraps around the circle? (Best Choice)

• 6π or about 18.84 ft

• 12π or about 37.68 ft

• 36π or about 113.04 ft

• 144π or about 452.16 ft

A center circle on a basketball court has a diameter of 12 feet.  What is the area of the circle? (Best Choice)

• 6π or about 18.84 ft²

• 12π or about 37.68 ft²

• 36π or about 113.04 ft²

• 144π or about 452.16 ft²

What is the area of the circle? (Best Choice)

• 5π or about 15.7 m²

• 10π or about 31.4 m²

• 20π or about 62.8 m²

• 100π or about 314 m²