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(a) Is every diameter of a circle also ...

(a) Is every diameter of a circle also a chord?
(b) Is every chord of a circle also a diameter?

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A circle chord is a straight line segment with both endpoints on a circular arc. The diameter is the length of a chord that goes through the centre of a circle.
(a) Yes, every circle's diameter is also a chord, since a circle's chord is any line segment connecting two points on the circumference.

(b) No, because the diameter goes through the circle's centre, every chord of a circle is not a diameter. As a result, every chord of a circle is also a diameter, and every diameter of a circle is not a chord.
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