Because a chord is a line between two points on the circumference; a radius starts at the circumference and ends at the centre, so it doesn't fit the criteria.
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a radius can be a chord beca- wait why would i know!?!?!?
longest chord = diameter y = longest chord y = diameter radius = 1/2 diameter therefore, radius = 1/2y
Bisects that chord
multiply the chord length and radius and divide by 2
its false