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.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 3 - Section 3.5 - Inequalities in a Triangle - Exercises - Page 165: 12b
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