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प्रश्न
A man has to build a rhombus shaped swimming pool. One of the diagonal is 13 m and the other is twice the first one. Then find the area of the swimming pool and also find the cost of cementing the floor at the rate of ₹ 15 per sq.cm
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उत्तर
Let the first diagonal d1 = 13 m
d2 = 2 × 13 m
= 26 m
Area of the rhombus = `1/2` × d1 × d2 sq.units
= `1/2` × 13 × 26 m2
= 169 m2
Cost of cementing 1 m2 = ₹ 15
Cost of cementing 169 m2 = ₹ 169 × 15 = ₹ 2,535
Cost of cementing = ₹ 2,535
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