# maths

A rhombus shaped sheet whose perimeter is 32cm and one of the diagonal is 10cm long painted on both the sides at the rate of rs5 per Sam.find the cost of painting.

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1. All four sides are equal, so each side of the rhombus is 8 cm
get angle Ø , opposite the 10 cm diagonal

10^2 = 8^2 + 8^2 - 2(8)(8)cosØ
cosØ = 7/32, then sinØ = 5√39/32

area = 8(8)sinØ
= ...

you take over

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posted by Reiny

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