Circles

Front

What is the formula to calculate the diameter of a circle if the radius is known?

Back

Diameter = 2 × Radius

Front

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

Back

20 cm

Front

What is the formula for calculating the circumference of a circle using the diameter?

Back

Circumference = π × Diameter

Front

How do you calculate the circumference of a circle if the radius is given?

Back

Circumference = 2 × π × Radius

Front

What is the value of π (pi) approximately?

Back

3.14

Front

If a circle has a diameter of 12 cm, what is its circumference?

Back

Approximately 37.68 cm (Circumference = π × 12)

Front

What is the relationship between the diameter and the radius of a circle?

Back

The diameter is twice the radius.

Front

If the circumference of a circle is 31.4 cm, what is the radius?

Back

Approximately 5 cm (Radius = Circumference / (2 × π))

Front

What is the circumference of a circle with a radius of 7 m?

Back

Approximately 43.96 m (Circumference = 2 × π × 7)

Front

How do you convert diameter to radius?

Back

Radius = Diameter / 2