Answer
It is possible.
See the picture below:
Work Step by Step
The sum of the interior angles in the triangle $50^{\circ} + 50^{\circ} + 80^{\circ}= 180^{\circ}$.
It is also an isosceles triangle, as it has two equal angles.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.