It is: 0.75*90 = 67.5 degrees
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There are 3/4 of 360 = 270 degrees.
A right angle triangle
A right angle is 900, so 2700 make three right angles.
A triangle is not an angle. A triangle is made of three angles. -- All three of them can be acute, but they don't need to be. -- One of them can be obtuse but doesn't need to be. -- One of them can be a right angle but doesn't need to be. -- If any angle in the triangle is right or obtuse, then the other two need to be acute.
112.5 degrees