circumference of a circle

Front

What is the diameter of a circle?

Back

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

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

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

Back

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

Front

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

Back

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

Front

If the diameter of a circle is 14 cm, what is the circumference?

Back

Circumference = π × diameter = π × 14 cm ≈ 43.98 cm.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

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 edge.

Front

If the circumference of a circle is 36π, what is the diameter?

Back

Diameter = Circumference / π = 36π / π = 36.

Front

What is the area of a circle?

Back

Area = π × radius².