Please help me with this problem

Step-by-step explanation:

So we are going to take note of the followingThat triangle is right-angled or has a 90 degree angle in itBut the notation on the other 2 angles tells us they are equal anglesSo the triangle is an Isosceles right triangle (a triangle with 2 equal angles and one 90 degree angle)The Isosceles triangle theorem tells us that if 2 angles are equal, then the sides opposite these angles are also equalSo and so we simplify is our answer

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