Question

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

Answer 1

In the given figure there are 16 triangles.

Each sides of triangle are a = 28 cm, b = 9 cm, c = 35 cm.

Perimeter of triangle = a + b + c

= 28 + 9 + 35 = 72 cm.

∴ Area of 16 triangles = 16 × 88.2 = 1411.2 sq.cm.

Polish expenditure for 1 sq.cm. = 50 p = Re. 0.5.

∴ Polish expenditure for 1411.2sq. cm. =?

= 1411.2 × 0.5

= Rs 705.6