Question 955729
I think you mean vertex angle.
The angles of the triangle sum to 180.
{{{5t-18+3t+3t=180}}}
{{{11t-18=180}}}
{{{11t=198}}}
{{{t=18}}}
So then,
{{{3t=54}}}
and
{{{5t-18=90-18=72}}}
54-54-72 triangle.