Parts of a circle: radius, diameter, chord, tangent and secant

An example figure from the Circle Generator.

A circle with center O, a diameter AB, a radius OC, a chord DE, a tangent touching the circle at F and a secant through G and H that runs on past both — A circle with its center O and eight named points on it. A diameter runs from A through O to B, a radius from O to C, and a chord from D to E along the bottom. A tangent touches the circle at F, and a secant cuts through G and H and runs on past both, for naming the parts of a circle.

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Answer key

Diameter AB · Radius OC · Chord DE · Tangent at F · Secant GH

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