Circles Review

A circle has a diameter of 12 cm. What is its circumference? (Use π = 3.14)

• 15.72 cm

• 24.56 cm

• 37.68 cm

• 10.26 cm

Evelyn, Michael, and Henry are planning to build a circular garden in their backyard. If they decide to make the garden with a diameter of 10 cm, what would be the area of the garden? (Use π = 3.14)

• 50.3 cm²

• 78.5 cm²

• 31.4 cm²

• 15.7 cm²

What is the area of a circle with a radius of 8 units? (Use π = 3.14)

• 64 square units

• 200.96 square units

• 16 square units

• 50.24 square units

What does the line segment on the circle represent?

• the radius

• the diameter

• the circumference

Identify the radius, diameter, and circumference of a circle with a circumference of 31.4 units. (Use π = 3.14)

• Radius = 3 units, Diameter = 6 units, Circumference = 18.84 units

• Radius = 5 units, Diameter = 10 units, Circumference = 31.4 units

• Radius = 8 units, Diameter = 16 units, Circumference = 50.24 units

• Radius = 12 units, Diameter = 24 units, Circumference = 75.36 units

Using the formula A = πr^2, find the area of a circle with a radius of 6 units. (Use π = 3.14)

• 18 square units

• 113.04 square units

• 36 square units

• 72 square units

Zoe is making a circular garden in her backyard. She has a rope of 14 cm to mark the boundary of the garden. What would be the radius and circumference of the garden? (Use π = 3.14)

• Radius: 14 cm, Circumference: 88 cm

• Radius: 3.5 cm, Circumference: 22 cm

• Radius: 10 cm, Circumference: 60 cm

• Radius: 7 cm, Circumference: 44 cm

The distance from the center of the circle to any point on the circle is called the...

• radius

• diameter

• circumference

• area

What is the radius?

• 18

• 72

• 38

• 14

Calculate the circumference of a circle with an area of 154 square units. (Use π = 3.14)

• 30 units

• 22 units

• 44 units

• 11 units