The sides of a triangular board are 13 metres, 14metres and 15 metres.

1.	The sides of a triangular board are 13 metres, 14metres and 15 metres. The cost of painting it atthe rate of Rs. 8.75 per m2 is
Answer» Sides of the triangle are 13m,14m, and 15m. semiperimeter of the triangle = (13+14+15)/2 = 42/2 = 21. Area of the triangle = √21(21–13)(21–14)(21–15) m² = √ 21876 m²= √ 7056 m²= 84m² Rate of painting = ₹8.75/m² Cost of painting the board = ₹8.7584= ₹735.

The sides of a triangular board are 13 metres, 14metres and 15 metres. The cost of painting it atthe rate of Rs. 8.75 per m2 is

Answer»

Sides of the triangle are 13m,14m, and 15m.

semiperimeter of the triangle = (13+14+15)/2 = 42/2 = 21.

Area of the triangle = √21(21–13)(21–14)(21–15) m² = √ 21*8*7*6 m²= √ 7056 m²= 84m²

Rate of painting = ₹8.75/m²

Cost of painting the board = ₹8.75*84= ₹735.