By definitions: two levels of them.
If it is has a right angle, it must be 90 degrees.
If it is a rectangle it must have right angles, otherwise it is not a rectangle.
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4 right angles. A right angle is a 90 Degree measure like for example: L <---- 90 degree measure. And the rectangle has 4 angles like that so it means it has 4 right angles.
Each angle of a rectangle is a right angle. (90°)
From its right angle. right angle --> rect angle.
It is exactly 90 degrees in angle measure. Take the angles on a rectangle or square for example.
a rectangle