Parts of Circles

Front

What is the diameter of a circle?

Back

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

Front

What is the radius of a circle?

Back

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

Front

What is the circumference of a circle?

Back

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

Front

How do you calculate the diameter if you know the radius?

Back

The diameter is calculated by multiplying the radius by 2 (d = 2r).

Front

How do you calculate the radius if you know the diameter?

Back

The radius is calculated by dividing the diameter by 2 (r = d/2).

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

What part of a circle is described by the term 'circumference'?

Back

Circumference refers to the total distance around the circle.

Front

If a circle has a radius of 3 inches, what is its diameter?

Back

The diameter is 6 inches.

Front

If a circle has a diameter of 10 inches, what is its radius?

Back

The radius is 5 inches.

Front

What is the formula for calculating the area of a circle?

Back

The area is calculated using the formula A = πr².