Question 260318
We need to use Pythagorean theorem here as
{{{a^2 + b^2 = c^2}}}
let a = 3 and c = 4, we get
{{{3^2 + b^2 = 4^2}}}
which is
{{{9 + b^2 = 16}}}
{{{b^2 = 7}}}
{{{b = sqrt(7)}}}