Parts of Circles

Front

What is the diameter of a circle?

Back

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

Front

How do you find the diameter if you are given the radius?

Back

Multiply the radius by 2.

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

What is the center of a circle?

Back

The center is the point that is equidistant from all points on the circumference.

Front

What is an arc in a circle?

Back

An arc is a part of the circumference of a circle.

Front

What is a minor arc?

Back

A minor arc is an arc that measures less than 180 degrees.

Front

What is a major arc?

Back

A major arc is an arc that measures more than 180 degrees.

Front

What is a semicircle?

Back

A semicircle is an arc that measures exactly 180 degrees.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What is the formula for the circumference of a circle?

Back

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