A=8,b=x,c=100

If you mean X representing one of the sides, the formula is:

The first side squared plus the second side squared.

Got that? After that, you do:

The answer of part one, squared (Why so many squares?). Then you find the square root of that. Ta-da!

So the actual mathematical formula is:

(S1 being side one and S2 being side two)

S1(exponent 2)+ S2(Exponent 2)=X(Exponent 2), then

(Square root thingy)X(Exponent two)

The first side squared plus the second side squared.

Got that? After that, you do:

The answer of part one, squared (Why so many squares?). Then you find the square root of that. Ta-da!

So the actual mathematical formula is:

(S1 being side one and S2 being side two)

S1(exponent 2)+ S2(Exponent 2)=X(Exponent 2), then

(Square root thingy)X(Exponent two)