Question 7427
Hopefully I am right.

{{{2x+x-45+x-15=180}}}
{{{4x-60=180}}}
{{{4x=180-60}}}
{{{4x=120}}}
{{{x=30}}}
{{{2x30=60}}}
{{{30-45=15}}}
{{{30-15=15}}}
{{{60+15+15=90}}}
I believe this is a RIGHT TRIANGLE