Parts of Circles

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the 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 a chord that passes through the center of the circle and is twice the length of the radius.

Tags

CCSS.HSG.C.A.2

Front

What is the center of a circle?

Back

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

Front

What is an arc in a circle?

Back

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

Tags

CCSS.HSG.C.B.5

Front

How is the radius related to the diameter?

Back

The radius is half the length of the diameter.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) is calculated as C = πd, where d is the diameter.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

The area (A) is calculated as A = πr², where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is a semicircle?

Back

A semicircle is half of a circle, formed by a diameter and the arc connecting its endpoints.

Front

What is a sector of a circle?

Back

A sector is a region enclosed by two radii and the arc between them.