Find the cost of turfing a triangular field at the rate Rs. 5/- m2 having lengths of its sides are 40m,
70m and 90m. (Take √20 = 4.17) , Maths Ch 12 Herons formula.
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Step-by-step explanation:
cost of turfing a triangular field
a=40,b=70m,c=90m
using heros formula S=
2
a+b+c
=
2
40+70+90
= 100
Area =
S(S−a)(S−b)(S−c)
=
100(100−40)(100−70)(100−90)
=
100×60×30×10
=
1800000
=1341.64m
1 5Rs
1341.64 (9)
=1341.64×5
=6708.20Rs Ans
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