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circle

all points around a center point

secant

line goes through a circle

tangent

line touches a circle at one point

point of tangency

tangent line intersects to where it is tangent

central angle

angle whose vertex is the center

arc

the part of the circle opposite of the vertex

measure of an arc

same as its central angle

inscribed angle

angle whose vertex is on the circle

intercepted arc

the arc created by inscribed angle

inscribed polygon

polygon inside a circle

circumscribed circle

circle outside a polygon

standard equation of a circle

finding the radius of a circle in a plane

locus

satisfy a given condition