Circumference

Front

What is the definition of circumference?

Back

The circumference is the distance around a circle.

Front

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

Back

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

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

If the radius of a circle is 9.5 mm, what is the diameter?

Back

Diameter = 2 × radius = 2 × 9.5 mm = 19 mm.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

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 18 cm?

Back

Circumference = 2 × π × 18 cm ≈ 113.1 cm.

Front

If a circle has a diameter of 16 cm, what is its circumference?

Back

Circumference = π × 16 cm ≈ 50.3 cm.

Front

What is the radius of a circle with a circumference of 37.7 cm?

Back

Radius = Circumference / (2 × π) ≈ 6 cm.

Front

What is the diameter of a circle with a circumference of 68.4 cm?

Back

Diameter = Circumference / π ≈ 21.8 cm.