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Question

If a square and a rhombus stand on the same base, prove that the square has the larger area.

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Solution


Let the side of the square be 'a'.
Let the diagonals be 2d1 and 2d2.
Area of the square, A1=a2
Using pythagoras theorem,
d21+d22=a2
Area of the rhombus, A2=12.2d1.2d2=2d1d2
(d1d2)2=d21+d222d1d2
d21+d22=(d1d2)2+2d1d2
Area of square = Positive quantity + Area of Rhombus
Area of Square > Area of Rhombus

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