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In a rhombus PQRS,the diagonals intersect at O.given that angle=120 degree and OP=3 cm.what is the side of the rhombus.

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What angle = 120 ?
If you mean angle PQR for example
then
triangle PQO is a 30 60 90 triangle
the cos 30 = 3/side
side = 3/cos 30

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