Question

Find the cost of levelling the ground in the form of a triangle with sides 16m, 12m and 2m at rs4 per square meter.

Answer 1

Let a= 16m, b= 12m, c= 2m.
Now, semi-perimeter = (a+b+c )/2 = (16+12+2)/2 =30/2 = 15m

Now, area of triangle = square root [s(s-a) (s-b) (s-c)] = 15 X 1 X 3 X 13 = 24 square metre

Therefore, cost of levelling 24 square metre area @ Rs. 4/square metre = 24 X4= Rs. 96

Answer 2

Answer:

384 rs

Step-by-step explanation:

Let the sides be

a=16,b=12,c=20. (By herons formula)

s = a+b+c = 16+12+20. 48 =. 24

A = √s(s-a)(s-b)(s-c)

A = √24(24-16)(24-12)(24-20)

A = √24×8×12×4

A = √(2×2×3×2)(2×2×2)(2×3×2)(2×2)

A = 2×2×2×2×2×3

A = 96 m sq.

Cost per metre=4

Cost for 96 m = 4×96

=384 rs