Question

the sides of a triangular ground are 5m,7m and 8m respectively.find the cost of leveling the ground at the rate of rupee 10 per meter square​

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

let the third side be x

18+10+x=42

hence, a=18,b=10,c=14

semi perimeter =a+b+c/2

=18+10+14/2

=42/2

=21

Heron's formula =√s(s-a)(s-b)(s-c)

so √21(21-18)(21-10)(21-14)

=√21(3)(11)(7)

=3×7×3×1×11×1×7×1

=3×7×1 √11

Ans=21√11