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Answer :
(i) By joining the ends of two diameters, we get a rectangle. By measuring, we find AB = CD and BC = AD i.e., pairs
of opposite sides are equal and also \(\angle \) A = \(\angle \) B = \(\angle \) C = \(\angle \) D = 90 ,
, i.e. each angle is of 90 .
Henc,e it is a rectangle.
(ii) If the diameters are perpendicular to each other, then by joining the ends of two diameters, we get a square.
By measuring, we find that AB = BC = CD = DA = i.e.,
all four sides are equal.
Also ? A = ? B = ? C = ? D = 90 ,
, i.e. each angle is of 90 .
Hence, it is a square.