Circumference

Front

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

Back

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

Front

If a circle has a diameter of 10 cm, what is its circumference?

Back

Circumference = π × 10 cm ≈ 31.4 cm.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius. (Diameter = 2 × radius)

Front

What is the radius of a circle with a circumference of 31.4 cm?

Back

Radius = Circumference / (2 × π) ≈ 5 cm.

Front

How do you find the diameter if you know the circumference?

Back

Diameter = Circumference / π.

Front

What is the circumference of a circle with a radius of 7 cm?

Back

Circumference = 2 × π × 7 cm ≈ 43.96 cm.

Front

What is the diameter of a circle with a circumference of 62.8 cm?

Back

Diameter = 62.8 cm / π ≈ 20 cm.

Front

What is the circumference of a circle with a diameter of 12 m?

Back

Circumference = π × 12 m ≈ 37.68 m.

Front

If the radius of a circle is 3.5 m, what is its diameter?

Back

Diameter = 2 × 3.5 m = 7 m.

Front

What is the circumference of a circle with a radius of 10 mm?

Back

Circumference = 2 × π × 10 mm ≈ 62.83 mm.