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An advertisement board is in the form of an isosceles triangle with perimeter 36m and each of the equal sides are 13 m.

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An advertisement board is in the form of an isosceles triangle with perimeter 36m and each of the equal sides are 13 m. Find the cost painting it at Rs 17.50 per square metre.

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Area of an isoceles triangle 

Cost of painting 1 m2 = Rs 17.50 

Cost of painting 60 m2 = 60 x 17.50 = Rs 1050

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