Circles

Front

What is the distance around a circle called?

Back

Circumference

Front

What do you call a line that touches a curve at a point without crossing over?

Back

Tangent

Front

What is half a circle or an arc that is 180 degrees?

Back

Semicircle

Front

What is the line segment between the center and a point on the circle?

Back

Radius

Front

What is the longer of the two arcs between two points on a circle?

Back

Major arc

Front

What is the distance from one side of the circle to the other, passing through the center?

Back

Diameter

Front

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

Back

Chord

Front

What is the smaller arc between two points on a circle?

Back

Minor arc

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd

Front

What is the area of a circle?

Back

A = πr²