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I'm not answering your question step by step, I'm just want to give you hint that you can find sides of rhombus by using Pythagoras formula because diagonals of rhombus intersect each other at 90 degree .
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It is (b) 50
Explaination:-
Right angled triangle formed in 60 and 80 which is equal to 30 and 40 four triangle with unknown triangle side if 30² ˣ 40² = x² which we have to find
x= 900 + 1600 = 2500
x= 50
Hence, side = 50
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