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
.
Solution:
Semi-perimeter of 1 triangular tile
cm
Using Heron’s formula, Area of 1 triangular tile
(approx.)
Area of 16 triangular tiles
.
Polishing of 1
of area costs 50 p
Polishing of
of area would cost
Rs
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