Question 775719
Let the angles be {{{A[1]}}}, {{{A[2]}}} and {{{A[3]}}}.


{{{A[1] + A[2] + A[3] = 180}}}


Also, {{{A[1]:A[2]:A[3]}}}::{{{2:5:3}}}


{{{A[1] = (180/(2+5+3))*2=36}}}
{{{A[2] = (180/(2+5+3))*5=90}}}
{{{A[3] = (180/(2+5+3))*3=54}}}