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Question -

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



Answer -

Given, length of the side of the triangular tile are 28 cm, 9 cm, and 35 cm.
Let a = 28 cm, b = 9 cm and c = 35 cm
Then, semi-perimeter of one triangular tile,

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