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 the circle.

Front

What is the diameter of a circle?

Back

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

Front

What is the circumference of a circle?

Back

The circumference is the total distance around the circle.

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.

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius (d = 2r).

Front

What is the center of a circle?

Back

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

Front

How do you calculate the circumference of a circle?

Back

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

Front

What is a sector of a circle?

Back

A sector is a portion of a circle enclosed by two radii and the arc between them.

Front

What is a segment of a circle?

Back

A segment is a region of a circle bounded by a chord and the arc connecting its endpoints.