adj=10 opp=100 hyp=?

In a RIGHT triangle  you can use the pythagorean theorem to calculate the sides of the triangle.

a^2 +b^2 = c^2    where a and b are the 'legs' and c is the hypotenuse

so:

10^2 + 100^2 = c^2

10,100 = c^2

c = hypotenuse = sqrt(10100) = 100.4987