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Since 2 of it's angles are equal (45 degrees), you have an isoceles triangle. Hence, two of its sides are the same.

Since the other angle is 90, you have a right angle triangle. This means that if you're missing the hypotenuse, you can use the Pythagorean theorem to find it.

H^2 = A^2 + B^2

Where H is the length of the hypotenuse, and A and B are the lengths of the other 2 sides. (Here, A = B).

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Q: How do you find the missing side of a 45 45 90 triangle?
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