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Question

Diagonals of a rhombus are 8cm,6cm respectively. Its side is-

A
5cm
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B
6cm
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C
7cm
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D
cannot be determined
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Solution

The correct option is A 5cm

Let ABCD is rhombus, AC and BD are diagonals.
AC=8cm and BD=6cm
We know that diagonals of rhombus perpendicularly bisect each other.
AO=AC2=82=4cm

BO=62=3cm
In right angles AOB,
(AB)2=(AO)2+(BO)2
(AB)2=(4)2+(3)2
(AB)2=16+9
(AB)2=25
AB=5cm
AB=BC=CD=DA=5cm [ In rhombus all sides are equal. ]


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