UPSC CDS Math Logarithm Questions

We know that Heron's formula, if we want to calculate area A of triangle
having sides a,b,c units is
A=√s(s−a)(s−b)(s−c)
Here, s=‌

a+b+c

2

We have,
a=30cm
b=28cm
c=16cm
Then, s=‌

30+28+16

2

=‌

74

2

=37
s−a=37−30=7
s−b=37−28=9
s−c=37−16=21
So, we have to know the logarithmic of 37,7,9 and 21 for finding the area of triangle.