Question 865850
Right triangle, and the non-right angles may be expressed, according to your ratio, 4x and 5x; so you would have sum of the angles equaling 180 degrees.


{{{4x+5x+90=180}}}.
{{{9x+90=180}}}
{{{9x=180-90=90}}}
{{{x=90/9}}}
{{{highlight_green(x=10)}}}.
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The angle measures other than the right angle are {{{4*10=40}}} and {{{5*10=50}}};  40 degrees and 50 degrees.