ACT-Practice on Circles (C & A)

Find the circumference of the circle in the image.

• 10π

• 20π

• 100π

• 20

What is the diameter of the circle in the image?

• 10

• 20π

• 20

• 100

What is the area of the circle in the image?

• 9π

• 12π

• 12

• 36π

What is the circumference of the circle in the image?

• 6

• 6π

• 12π

• 36π

A circle has an area of 36π. What is the circumference of the circle?

• 18π

• 12π

• 6π

• 36π

A rose garden is circular. The diameter of the garden is 18 feet. What is the area of the garden?

• 9π square feet

• 36π square feet

• 81π square feet

• 324π square feet

A circular swimming pool has a radius of 15 feet. The family that owns the swimming pool wants to put up a circular fence that is 5 feet away from the pool at all points. What is the circumference of the fence they will need? Hint: Draw what you know.

• 15π

• 20π

• 40π

• 30π

A circular pin has a diameter of 6.2 centimeters. What is the area of the circle?

• 38.44π square cm

• 9.61 square cm

• 6.2π square cm

• 9.61π square cm

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Use π = 3.14.

• 4 in.
• 8 in.
• 12 in.
• 16 in.

The circumference is 62.8 inches.  What is the radius?

• 20 inches
• 10 inches
• 6.28 inches
• 31.4 inches