Question 381833
Use the Pythagorean theorem 
{{{c^2 = a^2 + b^2}}}
you are given a and b
{{{c^2 = 5^2 + 12^2}}}
{{{c^2 = 25 + 144}}}
{{{c*2 = 169}}}
{{{c = sqrt(169)}}}
{{{c = 13}}}