Which of the following statements is true?
a. a radius is always a chord.
b. a tangent is always a secant.
c. a diameter is always a chord.
d. a chord is always a diameter.

A chord is a line which touches two points on the circle where as diameter is a line which touches two points on the circle but passes through the center of a circle so diameter can be alse called chord but chord can not be called diameter because it doesnot pass through center.so right option is C. A diameter is always a chord.

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