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The question asks whether an isosceles right triangle is always a 45-45-90 triangle. 

The correct answer is **A. True**.

Explanation: 
An isosceles right triangle has two equal sides and one right angle. The angles opposite the equal sides must be equal, and since the sum of the angles in any triangle is 180°, the other two angles are both 45°. Therefore, an isosceles right triangle always has angles of 45°, 45°, and 90°, making it a 45-45-90 triangle.

Would you like a further breakdown or explanation of the properties of a 45-45-90 triangle?

Here are 5 related questions for further understanding:
1. How do you calculate the hypotenuse of a 45-45-90 triangle?
2. What are the side length ratios in a 45-45-90 triangle?
3. Can an isosceles triangle be a different kind of right triangle besides 45-45-90?
4. How do you find the area of a 45-45-90 triangle given one leg?
5. What are

An isosceles right triangle is always a 45-45-90 triangle.

Explore why an isosceles right triangle is always a 45-45-90 triangle, with detailed explanations of the angle properties and relevant theorems. Suitable for students in Grades 8-10.

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