Circles Circumference and Arc Length

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

Find the circumference of the circle.

• 113.04

• 1017.36

• 254.34

• 56.55

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

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 the green area called?

• sector

• segment

• arc

• section

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 

If Circle X is dilated by a scale factor of 3 to form Circle Y, which of the following statements is NOT true?

• The radius of Circle Y is 3 times the radius of Circle X.

• The diameter of Circle Y is 3 times the diameter of Circle X.

• The circumference of Circle Y is 3 times the circumference of Circle X.

• The area of Circle Y is 3 times the area of Circle X.

What is the arc length of AB?

If the circumference of the circle is 52 what is the length of arc AC?

• 26

• 13

• 17

• 104