# Geometry

Let C(0, A) be the circle with center 0 and radius OA. Carefully define:

a. a diameter of the circle.

b. a chord of the circle.

C. a line tangent to the circle.

d. a secant line to the circle.

e. concentric circles.

{DIAGRAM}

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#### Solution Summary

Geometric features are shown on a diagram. The solution is detailed and well presented.

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