Finding Circumference

Front

What is the circumference of a circle?

Back

The circumference is the distance around a circle.

Front

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

Back

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

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

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

Back

Circumference = π × diameter = 3.14 × 10 = 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

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 × radius = 2 × 3.14 × 7 = 43.96 cm.

Front

What is the circumference of a circle with a diameter of 14 m?

Back

Circumference = π × diameter = 3.14 × 14 = 43.96 m.

Front

What is the term for the distance from the center of a circle to any point on its circumference?

Back

Radius.

Front

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

Back

Diameter = Circumference / π = 62.8 / 3.14 = 20 cm.