Circles Unit 3 Pre-Assessment Quiz

Calculate the circumference of a circle with a radius of 5 cm. (Use π = 3.14)

• 15.7 cm

• 31.4 cm

• 10 cm

• 25 cm

Answer explanation

The circumference of a circle can be calculated using the formula C = 2πr. Given a radius of 5 cm and π = 3.14, the circumference is 2 * 3.14 * 5 = 31.4 cm. Therefore, the correct answer is 31.4 cm.

Find the circumference of a circle with a diameter of 12 inches. (Use π = 3.14)

• 24.56 inches

• 45.32 inches

• 10.5 inches

• 37.68 inches

If the circumference of a circle is 31.4 cm, what is the radius? (Use π = 3.14)

• 20

• 10

• 5

• 15

Determine the area of a circle with a radius of 8 m. (Use π = 3.14)

• 100.48 m^2

• 200.96 m^2

• 50.24 m^2

• 16.28 m^2

What is the area of a circle with a diameter of 10 cm? (Use π = 3.14)

• 50.24 cm^2

• 15.7 cm^2

• 78.5 cm^2

• 31.4 cm^2

A circular swimming pool has a circumference of 100 feet. What is the diameter of the pool? (Use π = 3.14)

• 31.85 feet

• 20 feet

• 50 feet

• 75 feet

Identify the radius of a circle with a circumference of 18.84 cm. (Use π = 3.14)

• 9

• 12

• 6

• 3

What is the diameter of a circle with a circumference of 31.4 cm? (Use π = 3.14)

• 10 cm

• 20 cm

• 15 cm

• 5 cm

Using the formula C = 2πr, find the circumference of a circle with a radius of 6 cm. (Use π = 3.14)

• C = 3.14 * 6 = 18.84 cm

• C = 2 * 3.14 * 12 = 75.36 cm

• C = 2 * 3.14 * 6 = 37.68 cm

• C = 2 * 3.14 * 3 = 18.84 cm

If the circumference of a circle is 25.12 cm, what is the radius using the formula C = 2πr? (Use π = 3.14)

• 2

• 4

• 10

• 6