Question 263575
We have a right triangle, so we need to use Pythagorean theorem as
{{{a^2 + b^2 = c^2}}}
we know a = 2 and b = 4, so we can find c as
{{{2^2 + 4^2 = c^2}}}
and then
{{{4 + 16 = c^2}}}
adding we get
 {{{20 = c^2}}}
square root both sides to get
 {{{c = sqrt(20)}}}
this is
c = 2sqrt(5)
OR
c ~ 4.47