Geometry Quiz

What is the formula to find the area of a circle?

• Area = π * diameter

• Area = π * radius^2

• Area = 2 * π * radius

• Area = π * radius / 2

How do you calculate the circumference of a circle?

• Circumference = π * diameter

• Circumference = π * radius^2

• Circumference = 2 * π * radius

• Circumference = π * radius / 2

If the radius of a circle is 8 inches, what is the area of the circle? (Use π ≈ 3.14 and round your answer to the nearest tenth.)

• 50.2 in²

• 201.0 in²

• 100.5 in²

• 64.0 in²

If the diameter of a circle is 16.6 yards, what is the circumference of the circle? (Use π ≈ 3.14 and round your answer to the nearest tenth.)

• 52.1 yd

• 26.0 yd

• 104.2 yd

• 13.0 yd

What is the radius of the circle shown in item 11?

• 4.2 yd

• 8.4 yd

• 2.1 yd

• 6.3 yd

What is the radius of the circle shown in item 12?

• 6.2 mi

• 12.4 mi

• 3.1 mi

• 9.3 mi

If the circumference of a circle is 62.8 miles, what is the radius of the circle? (Use your calculator's value of π and round your answer to the nearest tenth.)

• 10.0 mi

• 20.0 mi

• 30.0 mi

• 40.0 mi

If the area of a circle is 201.1 square inches, what is the diameter of the circle? (Use your calculator's value of π and round your answer to the nearest tenth.)

• 16.0 in

• 32.0 in

• 8.0 in

• 64.0 in

What is the circumference of a circle with an area of 64π square meters?

• 8π m

• 16π m

• 32π m

• 64π m

What is the area of a shape with a circumference of 6π yards?

• 9π yd²

• 18π yd²

• 36π yd²

• 72π yd²