How can we help?

You can also find more resources in our Help Center.

14 terms

Geometry Circles Vocabulary

Circles
STUDY
PLAY
Circle
A shape consisting of those points in a plane which are equidistant from a given point called the center.
Pi (π)
The ratio of the circumference to the diameter of a circle.
Radius
A line from the center of the circle of the circle to any point on the circle.
Radii
more than 1 radius.
Chord
A line segment that links 2 points on a circle.
Diameter
A chord that crosses through the center of the circle.
Tangent
A line or ray that interests a circle at only 1 point.
Point of Tangency
The point where a circle and a tangent intersect.
Arc
Part of a circle with an angle measure.
Minor Arc
Arc whose measure is smaller than 180 degrees.
Major Arc
Arc whose measures is larger than 180 degrees.
Semi-circle
Arc whose measure is equal to 180 degrees.
Central Angle
An angle whose vertex is a center of a circle.
Congruent Circles
Circles with congruent radii.