Circumference and Area of Circle Word Problems

What is the approximate circumference of a circle with a radius of 5 in.?

• 16 in

• 20 in

• 31 in

• 79 in

• 81 in²

• 29.8 in2

• 59.7 in2

• 283.4 in2

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

• 10 ft

• 12 ft

• 11 ft

• 21 ft

If the problem ask you to find the distance around a circle, which formula should you use?

• r = d/2

• d = 2r

• C = πd

• A = πr²

• 12.56 sq ft

• 56.52 sq ft

• 25.12 sq ft

• 3.14 sq ft

• 50.24  yd

• 25.12 yd

• 38.92  yd

• 12.56 yd

Which formula would you use to answer: Ethan is painting a large circle on one wall of his new apartment. The circle is 8 feet across. Approximately how many square feet of wall will the circle cover?

If the word problem is asking you to find the space inside the circle, which formula should you use?

• r = d/2

• d = 2r

• C = πd

• A = πr²

Which formula would you use to answer: Lauren's bicycle tire has a diameter of 20 inches. How many inches is one full revolution of the wheel?

A circular mirror has a 2 inch frame around it. The mirror itself is 8 inches in diameter. What is the area of the frame? Use 3.14 for pi.