Four inside angles, all of them being right angles (90 degrees) in each corner. You could also count the four outside angles, outside each corner, each one being 270 degrees. (Adding one inside angle with its outside angle = 360 degrees (a circle)
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A rectangle has 4 right angles.
A rectangle has 4 interior 90 degree angles
A rectangle has four congruent angles. There's your answer and thanks for asking!
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