Question

please can you tell me in brief
what is chord if a circle?

Answer 1

If u join one end of a circle to another end of the same circle, then it is a chord. Diameter is also a chord.

Answer 2

inside a circle if one point is joint to any other point then that path will be called a chord and both points must lie on the circle.diameter is the longest chord of a circle.
hope it helps
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