## Elementary Technical Mathematics

Using the Pythagorean Theorem, we can plug in our variable and then solve: $${a}^2+{b}^2 = {c}^2$$ $${45.0}^2+{b}^2 = {75.0}^2$$ Rearranging gives, $${b} = \sqrt{{75.0}^2-{45.0}^2}$$ The answer, to 3 significant digits is $$b = 60.0$$