Circumference Practice

Front

What is the formula to calculate the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

If the diameter of a circle is 14 cm, what is the circumference?

Back

43.98 cm.

Front

What is the relationship between diameter and radius?

Back

The radius is half of the diameter.

Front

If the diameter is 19 inches, what is the radius?

Back

9.5 inches.

Front

What is the distance around a circle called?

Back

Circumference.

Front

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

Back

20 ft.

Front

What is the circumference of a circular swimming pool with a diameter of 21 feet?

Back

65.94 ft.

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.

Front

What is the circumference of a circle with a radius of 5 cm?

Back

31.4 cm.

Front

If a circle has a circumference of 62.8 ft, what is its diameter?

Back

20 ft.