No a sphere doesn't even have any angles
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A shape with 4 right angles would be a square or rectangle. A trapezoid does not have any right angles..
A polygon with six or more sides, in which four of the angles are right angles and the other angles are not. These others are of any type - as required. It cannot be a pentagon because, if 4 angles are right angles, the fifth would be 180 degrees!
Any 2 angles that add up to 90 degrees.
a circle
Yes. Rectangles have four right angles.