Area and Circumference of Circles

What is the formula for the area of a circle?

What is the formula for the circumference of a circle?

If the diameter of a circle is 10 cm, what is its radius?

• 5 cm

• 10 cm

• 15 cm

• 20 cm

If the radius of a circle is 7 cm, what is its diameter?

• 7 cm

• 14 cm

• 21 cm

• 28 cm

A circle has a radius of 4 cm. What is its area?

A circle has a diameter of 12 cm. What is its circumference?

• 5 cm

• 10 cm

• 15 cm

• 20 cm

• 5 cm

• 10 cm

• 15 cm

• 20 cm

A circular garden has a radius of 3 meters. What is the circumference of the garden?

A circular track has a diameter of 50 meters. What is the area of the track?