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A floral design on a floor is made up of 16 triangular tiles, each having sides 9cm, 28 cm and 35 cm. Find the cost of polishing the tiles at the rate of Rs. 2.50 per cm2
[Take =2.454]
Let the sides of triangle be 9 cm, 28 cm, and 35 cm
Semi perimeter,
Now, using Heron’s formula,
(Area of 1 tile)
= 88.2cm2
∴ Area of 16 tiles = 16 × area of one tile
= 16 × 88.2 cm2
= 1411.2 cm2
Now, cost of polishing 1cm2 area = Rs 2.5
∴ Cost of polishing 1411.2 cm2 = 2.5 × 1411.2 = Rs 3528
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The correct answer is :
(a)-…….. (b)-……..
(c)-……… (d)-………