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 diameter is a line segment that passes through the center of the circle, connecting two points on its circumference.

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 is the radius of a circle?

Back

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

Front

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

Back

Circumference = 2 × π × radius.

Front

What is the approximate value of π (pi)?

Back

π (pi) is approximately 3.14.

Front

If a circle has a circumference of 31.4 cm, what is its diameter?

Back

Diameter = Circumference / π = 31.4 cm / 3.14 = 10 cm.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

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

Back

Circumference = π × diameter = 3.14 × 12 m = 37.68 m.

Front

If the diameter of a circle is 8 cm, what is the radius?

Back

Radius = Diameter / 2 = 8 cm / 2 = 4 cm.