Circle Parts and Circumference

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle, calculated using the formula C = πd or C = 2πr.

Front

What does the symbol π (pi) represent?

Back

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

Front

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

Back

The circumference is 31.4 cm (C = πd = π * 10).

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

If the radius of a circle is 4 cm, what is the diameter?

Back

The diameter is 8 cm (Diameter = 2 * Radius).

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 calculate the circumference using the radius?

Back

Circumference can be calculated using the formula C = 2πr.

Front

What is the approximate value of π?

Back

The approximate value of π is 3.14.

Front

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

Back

The diameter is 20 cm (Diameter = C/π = 62.8/3.14).

Front

What is the formula for the area of a circle?

Back

The area of a circle is calculated using the formula A = πr².