Circumference and Working Backwards Practice

Front

What is the formula for calculating the circumference of a circle?

Back

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

Front

If the diameter of a circle is 10 inches, what is the circumference?

Back

Circumference = π × 10 inches ≈ 31.42 inches.

Front

What is the relationship between diameter and radius?

Back

The radius is half of the diameter. Radius = diameter / 2.

Front

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

Back

Radius = Circumference / (2 × π).

Front

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

Back

Circumference = 2 × π × 5 cm ≈ 31.42 cm.

Front

What is the perimeter of a rectangle?

Back

Perimeter = 2 × (length + width).

Front

If a circle has a circumference of 62.83 cm, what is its diameter?

Back

Diameter = Circumference / π ≈ 20 cm.

Front

What is the circumference of a pizza with a diameter of 12 inches?

Back

Circumference = π × 12 inches ≈ 37.68 inches.

Front

If the radius of a circle is 7 meters, what is the circumference?

Back

Circumference = 2 × π × 7 m ≈ 43.98 m.

Front

What is the diameter of a circle with a circumference of 31.42 inches?

Back

Diameter = Circumference / π ≈ 10 inches.