None All shapes would be 360 degrees not 380 look at a circle , square, octagon etc.
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Squares don't 'represent' angles. A shape is a square only if it has four equal sides and four 90-degree angles. If it doesn't have those, then it's not a square.
A right angle triangle has one 90 degree angle and two acute angles
It is a square or a rectangle both of which have 4 interior 90 degree angles
If there are two 90 degree angles on the shape (example: squares or rectangles' corners)
There's no such name that covers all shapes with a 90 degree angle.Squares have them, and so do rectangles.A trapezoid could have one, but not more than one.And any polygon with more than four sides can have one or more 90-degree angles,but not all of its angles can be 90 degrees.