Find the measure of angle y. Round your answer to the nearest hundredth. (please type the numerical answer only)

So we know that a triangle must add up to 180 degrees and in this diagram, we are given no further information, just the fact that one angle in the triangle is ninety degrees
So, let y equal one unknown angle
So, then our equation becomes 2y+90=180
We move the positive ninety to the other side as a negative
So we are left with 2y=90
Then we divide by two
So therefore y equals to 45degrees

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