Area and Circumference of a Circle

Front

What is the radius of a circle?

Back

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

Front

What is the diameter of a circle?

Back

The diameter of a circle is twice the length of the radius. It is the distance across the circle through its center.

Front

How do you calculate the circumference of a circle?

Back

The circumference (C) of a circle can be calculated using the formula: C = 2πr, where r is the radius.

Front

What is the formula for the area of a circle?

Back

The area (A) of a circle can be calculated using the formula: A = πr², where r is the radius.

Front

If the radius of a circle is 15 cm, what is its diameter?

Back

30 cm

Front

Calculate the circumference of a circle with a radius of 9 cm (use π = 3.14).

Back

56.52 cm

Front

What is the area of a circle with a radius of 7 cm (use π = 3.14)?

Back

153.86 cm²

Front

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

Back

7 cm

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (D = 2r).

Front

If a circle has a circumference of 31.4 cm, what is its radius? (Use π = 3.14)

Back

5 cm