A board has triangular shape. Its sides are 13 m, 14 m and 15 m. The rate of colouring
the board is rupees 9.25 per sq. m. What will be the total expenditure of colouring ?
1) 777
2) 756
3) 735
4) 750
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Answer is 777
Sides of triangle= 13m,14m,15m
Semiperimeter of tri = (13+14+15)/2
= 42/2. =21
Area of tri = √21 (21-13)(21-14)(21-15)m^2
= (√21x8x7x6)m^2
= √7056msq
=84 m.sq
Rate of colouring =₹9.5/sq.m
Total exp = 84x9.5
= ₹777
Sides of triangle= 13m,14m,15m
Semiperimeter of tri = (13+14+15)/2
= 42/2. =21
Area of tri = √21 (21-13)(21-14)(21-15)m^2
= (√21x8x7x6)m^2
= √7056msq
=84 m.sq
Rate of colouring =₹9.5/sq.m
Total exp = 84x9.5
= ₹777
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