Circle Vocabulary

Front

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

Back

Radius

Front

What do you call a line segment that passes through the center of a circle and has its endpoints on the circle?

Back

Diameter

Front

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

Back

Central Angle

Front

What is the term for a part of the circumference of a circle?

Back

Arc

Front

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

Back

Tangent

Front

What is the term for the longest arc connecting two points on a circle?

Back

Major Arc

Front

What is the term for the shortest arc connecting two points on a circle?

Back

Minor Arc

Front

What do you call a line segment whose endpoints lie on the circle?

Back

Chord

Front

What is the area of a sector of a circle?

Back

(θ/360) * π * r², where θ is the central angle in degrees and r is the radius.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where r is the radius.