15^2*pi*x/3

 

Nice use of the Math (input=result) GoldenLeaf

 

or better still, leave it as (this is exact - the other is an approximation) 

$$75\pi x$$

$${\frac{{{\mathtt{15}}}^{{\mathtt{2}}}{\mathtt{\,\times\,}}{\mathtt{\pi}}{\mathtt{\,\times\,}}{\mathtt{x}}}{{\mathtt{3}}}}$$

 

I believe this is what you're trying to say?

 

if so, 15^2 = 225 and from there 225 is multiplied with pi.

 

$${\frac{{\mathtt{225}}{\mathtt{\,\times\,}}{\mathtt{\pi}}{\mathtt{\,\times\,}}{\mathtt{x}}}{{\mathtt{3}}}}$$

 

Divide 225 by 3 to get rid of the exponent. This gives:

 

$${\mathtt{75}}{\mathtt{\,\times\,}}{\mathtt{\pi}}{\mathtt{\,\times\,}}{\mathtt{x}}$$

 

Multiply 75 and pi.

 

$${\mathtt{235.619\: \!449\: \!019\: \!234\: \!492\: \!9}}{\mathtt{\,\times\,}}{\mathtt{x}}$$

 

Round to whatever nearest decimal value reccomended and there's your answer.

 

Divide 225 by 3 to get rid of the exponent.

W*F  dimension of math is this from?

Good point

"Divide 225 by 3 to get rid of the exponent. "

There is no exponent here.  An exponent is a power.

The rest of the answer is pretty good though.

Although, it better to leave the answer exact.