Circumference and Pi

Front

What is the circumference of a circle?

Back

The distance around a circle.

Front

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

Back

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

Front

What is the diameter of a circle?

Back

The distance across the circle through its center, equal to twice the radius.

Front

What is the radius of a circle?

Back

The distance from the center of the circle to any point on its circumference.

Front

What is Pi (π)?

Back

A mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

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

Back

Circumference = π × 10 cm ≈ 31.4 cm.

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

Diameter = 2 × radius = 2 × 5 cm = 10 cm.

Front

What happens to the circumference if the radius of a circle is doubled?

Back

The circumference also doubles.

Front

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

Back

Radius = Circumference / (2 × π).

Front

What is the relationship between diameter and radius?

Back

The radius is half of the diameter.