Answers

2015-12-22T21:47:51+05:30
no
only the longest chord of the circle is the diameter
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2015-12-22T22:02:10+05:30
No 
every chord is not a diameter but every diameter is a chord because a diameter is a line passing through the center of the circle(longest chord) while chord is a line from one point of the circumference of circle to the other 
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