Shankar Agarwal
Level
pending
Four equal ,equilateral triangles of side 1cm is joined together to form parallelogram. Find the length of its longest diagonal in this parallelogram.
The answer is 2.645.
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1 solution
If all the triangles are arranged to form a parallelogram then the largest angle formed will be of 120 degree= 60+60 Therefore by applying the cosine rule we will have the answer as follows (digonal )square= (1st side) square+(2nd side) square - 2 S1 S2*cos120