triangles
squares
rectangles
i think most shapes could have a 90 degree angle except a circle
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Yes. All 90-degree angles are "right angles", and all right angles are 90 degrees. Anything else is not a right angle.
Regular shapes are shapes where all the sides and angles are equal. One example of a regular shape is a square because all the sides are the same and all the angles are 90 degrees.
yes!! a square! a squares angles are all 90 degrees. and a quadrilateral with 2 90 degree angles, and 1 with 40 one with 50. very possible.
There is an infinite number of complementary angles. Complementary angles are all angles that add up to 90 degrees, such as two 45 degree angles.
Yes.