yes, either 4 or if you are lucky you will find 7
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No, all four angles with in a rectangle are right angles.
squares, rectangles, some rhombuses .... I'm not sure all angles can be congruent
"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.
Some rectangles do. We call those rectangles squares. There's not a "why", really, unless you want to get into etymology, in which case this question should be in language categories and not math categories.
Rectangles have 4 rift angles and some parallelogram doesn't have 4 right angles. Only two parallelogram has 4 right angles , square and rectangle