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A floral design on a floor is made up of 16 tiles which are triangular, the sides of the triangle being 9 cm, 28 cm and 35 cm (see figure). Find the cost of polishing the tiles at the rate of 50 p per cm2

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We have lengths of the sides of 1 triangular tile are a = 35 cm, b = 28 cm, c = 9 cm. 

∴ s = a +b + c/ 2 = 35 + 28 +9 /2 cm = 36 cm 

Cost of polishing 1 cm2 = 50 p = Re 0.50 

∴ Total cost of polishing the floral design = Rs 16 × 88.2 × 0.50 

= Rs 705.60 Ans.

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