The length of a side of a rhombus is 5m and one of its diagonals is length 8m. The length of the other diagonal is
A
5m
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B
7m
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C
6m
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D
8m
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Solution
The correct option is C6m 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=25−16=9 ⇒d22=√9=3 ⇒d2=3×2=6