Question 306734
Pythagorean theorem says:
{{{a^2 + b^2 = c^2}}}
.
So, given:
a=52 b=? c=86 
we plug it in:
{{{52^2 + b^2 = 86^2}}}
{{{b^2 = 86^2 - 52^2}}}
{{{b^2 = 4692}}}
{{{b = sqrt(4692)}}}
{{{b = 68.5}}}