Well, it doesn't exactly have "an angle that measures 45 and 90 degrees".
It has one angle that measures 45 degrees, and another angle that measures 90 degrees.
That's an isosceles right triangle. The third angle is also 45 degrees, and
the length of each leg is 70.7% of the length of the hypotenuse. .
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I assume you mean a triangle. 180 degrees - 45 degrees - 90 degrees = 45 degrees
isosceles right angle traingle
If it's a triangle then the 3rd angle is 35 degrees
80
As many as you like because any triangle that has a 90 degree angle is always a right angle triangle.