Measuring Circles

Front

What is the definition of a radius in a circle?

Back

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

Front

What is the definition of a diameter in a circle?

Back

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

Front

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

Back

8

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

Calculate the area of a circle with a radius of 7. What is the area?

Back

153.86

Front

What is the value of π (pi)?

Back

Approximately 3.14.

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × d, where d is the diameter.

Front

Find the circumference of a circle with a diameter of 11 mm.

Back

34.54 mm.

Front

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

Back

5.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius.