Question

How do I find the length of the side.

Answer 1

Use the Pythagorean theorem /look at the picture/

? = x


`1.\\x^2+13^2=28^2\\x^2+169=784\ \ \ |subtract\ 169\ from\ both\ sides\\x^2=615\\\boxed{x=√(615)}\\\\3.\\x^2+10^2=28^2\\x^2+100=784\ \ \ \ |subtract\ 100\ from\ both\ sides\\x^2=684\\x=√(684)\\x=√(36\cdot19)\\x=√(36)\cdot√(19)\\\boxed{x=6√(19)}`