Circumference, Area and Degrees

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)

How many degrees are in a circle?

• 90

• 180

• 270

• 360

What is the green area called?

• sector

• segment

• arc

• section

Meg swam from one side of her circular pool to the other side going through the center. If Meg swam 8 feet, what is the approximate circumference of Meg's pool?

• 16 feet

• 25.13 feet

• 251.2 feet

• 4 feet

Find the circumference of a circle with a radius of 12.5 mm .

• 37.68mm

• 18.84mm

• 78.5mm

• none of the above

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 

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

• 36 meters

• 6 meters

• 12 meters

• 18 meters

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

• πr²

• 2πr

• √π