Question 355707
Let the three angles be A,B and C from smallest to largest.
Since it's a triangle,
{{{A+B+C=180}}}
.
.
.
{{{A=(1/9)C}}}
{{{C=9A}}}
.
.
{{{B=5A}}}
Substitute,
{{{A+5A+9A=180}}}
{{{15A=180}}}
{{{highlight( A=12)}}}degrees
Then,
{{{B=5(12)}}}
{{{highlight(B= 60)}}}degrees
And,
{{{C=9(12)}}}
{{{highlight( C=108)}}}degrees