Circumference, Area and Arc of Circle

A circle has a circumference of 36π meters. What is the radius of the circle?

• 36 meters

• 6 meters

• 12 meters

• 18 meters

A Circle has a radius of 6 inches.  What is the area of the circle? (Best Choice)

• 3π or about 9.42 in²

• 6π or about 18.84 in²

• 12π or about 37.68 in²

• 36π or about 113.04 in² 

What is the radius of a circle with an area of 49π?

• 49

• 10

• 7

• 14

What is the area of the shaded sector?

• 40π/9 (13.96)

• 400π/9 (139.6)

• 80π/9 (27.9)

• 1600π/9 (558.5)

What is the green area called?

• sector

• segment

• arc

• section

The homeowners association wants to enclose a circular playground in a fence. The need to find the amount of fencing they need to purchase.  Will they need the area or circumference of the playground?

• area

• circumference

• neither

Danielle wants to make a cookies for 3 friends. The radius of a cookie is 5 inches. If she wants to ice ALL 3 of the cookies, how many square inches of cookies must she cover with icing?

• 47.1 in²

• 235.5 in²

• 78.5 in²

• 15.7 in² 

What is the area of the shaded region?

• 50.27 units²

• 3015.93 units²

• 8.38 units²

• 4.19 units²

What is/are the formula(s) to find the area of a circle?

• πr²

• 2πr

• √π

What is the circumference of a circle?

• the distance around a circle

• the area of a circle

• halfway through a circle

• a line through the center of a circle