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Question

The length of a side of a rhombus is 5 m and one of its diagonals is length 8 m. The length of the other diagonal is

A
5 m
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B
7 m
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C
6 m
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D
8 m
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Solution

The correct option is C 6 m
Diagonals of rhombus are cut each other at 90.
Since d1=8 and a=5
Therefore, By Pythagoras theorem
a2=(d12)2+(d22)2
52=42+(d22)2
(d22)2=2516=9
d22=9=3
d2=3×2=6

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