Parts of circle

Front

What is the definition of a circle?

Back

A circle is a set of points in a plane that are equidistant from a fixed point called the center.

Front

What is the center of a circle?

Back

The center of a circle is the fixed point from which all points on the circle are equidistant.

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.

Tags

CCSS.HSG.C.A.2

Front

How do you calculate the circumference of a circle?

Back

The circumference can be calculated using the formula C = πd or C = 2πr, where d is the diameter and r is the radius.

Tags

CCSS.7.G.B.4

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 relationship between the diameter and the radius?

Back

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

Tags

CCSS.7.G.B.4

Front

What is a sector of a circle?

Back

A sector is a region of a circle bounded by two radii and the arc between them.

Front

What is an arc in a circle?

Back

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

Tags

CCSS.HSG.C.B.5

Front

What is a tangent to a circle?

Back

A tangent is a line that touches the circle at exactly one point.