It can be bigger or smaller, but not equal to.
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a right angle is exactly a 90 degree angle. for example, there are 4 right angles on a square, the corners are right angles. like the edges on papers that is a right angle. an oblique line is smaller than a right angle.
An oblique triangle has no right angle.
I believe that a sphere is neither oblique nor a right (angle?).
If the angle from the base to the highest point is a right angle, it is right. If not, it is oblique.
slanting. neither a right angle or a multiple of it.