Geometry

Question Analysis:  
This question involves isosceles right triangles, a special type of isosceles triangle.  
The main focus is on recognizing angle relationships and side properties.  

Key Concept Explanation:  
- In an isosceles right triangle, one angle is 90°, and the two base angles are always 45°.  
- The two legs are equal, while the hypotenuse is longer.  
- The sum of the angles in a triangle is always .  

Step-by-Step Solution:  
1. Since it is an isosceles right triangle, one angle is 90°, and the two equal angles must be:  
 
2. The two legs are equal because the triangle is isosceles.  
3. The hypotenuse is longer than the legs (by the Pythagorean theorem,

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