Circle Terminology

Front

What is the point in the center of a circle called?

Back

center

Front

What is the name of the line segment that connects two points on a circle?

Back

Chord

Front

A sector of a circle is ...

Back

a region of the circle bounded by two radii and an arc lying between the radii.

Front

What name is given for the perimeter (the distance around) a circle?

Back

circumference

Front

An arc is ...

Back

any connected part of the circle.

Front

What is the longest chord in a circle called?

Back

Diameter

Front

What is the distance from the center of the circle to any point on the circumference called?

Back

Radius

Front

What do you call a line that touches a circle at exactly one point?

Back

Tangent

Front

What is the term for the angle formed at the center of the circle by two radii?

Back

Central angle

Tags

CCSS.HSG.C.A.2

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd

Tags

CCSS.7.G.B.4