Circle Unit Vocabulary

Front

an arc of a circle that is exactly 180⁰

Back

semicircle

Front

the distance between two points of a circle

Back

diameter

Front

the angle is the arc divided by two (the angle is 1/2 of the arc)

Back

inscribed angles

Front

the distance from the center of a circle to a point on the circle

Back

radius

Front

The set of all points that are a fixed distance from a central point

Back

circle

Front

the longest chord of a circle

Back

diameter

Front

a line segment with both endpoints on the circle

Back

chord

Front

the angle whose vertex is at the center of the circle

Back

central angle

Front

the distance from the center of the circle to the circumference

Back

radius

Front

the measure of the space inside a circle

Back

area