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I am reading about "special triangles" 45.45.right angle.

I was reading how they found the ratios of the sides of a triangle.

It looks like they let the leg opposite of the 45 deg angle be length A and the corresponding 45 deg angle be length A aswell.. then they used the Pythagorean theorem to find the hyp.

Well I am curious if this can be done with any triangle? I have an attachment and I would like to know if I am correct? For my illustration I picked a 90.70.20 triangle at random.

I was reading how they found the ratios of the sides of a triangle.

It looks like they let the leg opposite of the 45 deg angle be length A and the corresponding 45 deg angle be length A aswell.. then they used the Pythagorean theorem to find the hyp.

Well I am curious if this can be done with any triangle? I have an attachment and I would like to know if I am correct? For my illustration I picked a 90.70.20 triangle at random.