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.
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Geometric features are shown on a diagram. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.