The answer is a rectangle because the angles in a rectangle add up to 360`, since a right angle measures 90`. Then four times 90` (4 * 90`=360`).
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The two quadrilaterals that have four right angles are rectangles and squares.
A square or a rectangle are both quadrilaterals consisting of four right angles.
rectangles, squares
"Quadrilateral" simply means "four sided". Some quadrilaterals do have right angles; squares or rectangles, for example. Some have one or two right angles, but some don't have any right (90 degree) angles.
Yes, all Quadrilaterals have four sides, therefore they must have 4 angles.