Question

what is the longest chord of a circle called?

Answer 1

Longest chord of a circle is

"DIAMETER"

Firstly, a chord a line joining the circumference of circle with two end points,

There is a special chord which not only joins two end points but pass through the third point that is center, hence the chord passing trough center is longest and is Diameter.

Also that a chord which divides circle in two equal segments is the longest, thats again the "DIAMETER"

Answer 2

Longest chord of circle is known as diameter.
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hope it helps u...thnku