Question 598534
Let x = one of the congruent angles, then the third angle is 180-2x..
{{{2x = ((180-2x)/2)-30}}} Simplify.
{{{2x = 90-x-30}}}
{{{2x = 60-x}}} Add x to both sides.
{{{3x = 60}}} Divide both sides by 3.
{{{x = 20}}}
{{{180-2x = 180-40}}}={{{140}}}
The angles are:
20 degrees, 20 degrees, and 140 degrees.