Yes
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0 or 4 corners
Yes. 4 corners forms 4 right angle.
A square has no acute angles but it does have 4 right angle corners.
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.
a square with 3/4 of its corners cut off