Parts of a Circle

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 diameter of a circle?

Back

The diameter is a line segment that passes through the center of the circle and has its endpoints on the circle. It is twice the length of the radius.

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle, but it does not pass through the center.

Front

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

Back

To find the radius, divide the diameter by 2.

Front

If a circle has a diameter of 40 ft, what is its radius?

Back

20 ft

Front

What is the center of a circle?

Back

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

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

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

Back

20 m

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle, calculated as C = 2πr, where r is the radius.

Front

What is the area of a circle?

Back

The area is the space contained within the circle, calculated as A = πr², where r is the radius.