Module 8 Review - Circles

What is the approximate circumference of a plate with a diameter of 12 inches? Use 3.14 for π. Round to the nearest hundredth if necessary.

• 37.68 inches

• 28.15 inches

• 18.84 inches

• 15.14 inches

Jalisa has a circular swimming pool with a radius of 4.1 meters. What is the circumference of the pool? Express your answer in terms of π.

(a)  

A circular garden has a circumference of 40.25 feet. Find the approximate diameter of the garden. Use 3.14 for π. Round to the nearest hundredth if necessary.

(a)  

A carpenter has two different-sized circular saws. The smaller saw has the radius shown. The larger saw has a diameter that is 1.75 inches greater than the diameter of the smaller one. How much greater is the circumference of the larger saw than the smaller saw? Use 3.14 for π. Write your answer as a decimal rounded to the nearest hundredth.

(a)  

What is the approximate circumference of a circle with a diameter of 3.6 yards? Use 3.14 for π. Round to the nearest hundredth if necessary.

(a)  

Find the approximate area of the circle shown. Use 3.14 for π. Round to the nearest hundredth if necessary.

(a)  

A dime has a diameter of 17.91 millimeters. What is the approximate area of the face of a dime? Use 3.14 for π. Round to the nearest hundredth if necessary.

(a)  

The Brunsons had a new concrete patio installed in the shape of a semicircle as shown. Mr. Brunson wants to cover the patio with concrete sealer. What is the approximate area he will need to cover with concrete sealer? Use 3.14 for π. Round to the nearest hundredth if necessary.

• A. 500.49 ft²

• B. 250.24 ft²

• C. 125.12 ft²

• D. 79.29 ft²

The exact circumference of a circle is 13.3pi inches. What is the area of the circle? Express your answer in terms of π. Round to the nearest hundredth if necessary.

(a)  

What is the approximate area of a circle with a radius of 7 cm? Use 3.14 for π. Round to the nearest hundredth if necessary.

(a)