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That would turn it into an octagon.
An example of a 90 degree angle is any of the four corners of an A4 page.
By cutting off two of its corners which will leave you with 2 triangles and 1 pentagon.
No. A circle has no corners and a square has four corners. There is no object that has no corners and four corners.
a heptagon has 7 corners and a octagon has 8 corners .