ncert class 9 math exercise 12.1 questions no 8
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Ex 12.2 Class 9 Maths Question 8.
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 paise per
Solution:
Let the sides of the triangle be a = 9 cm, b = 28 cm, c = 3
Total area of all the 16 triangles = (16 x 88.2) cm2 = 1411.2 cm2 (approx.)
Cost of polishing the tiles = Rs. 0.5 per cm2
∴ Cost of polishing all the tiles = Rs. (0.5 x 1411.2) = Rs. 705.60 (approx.)
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