Not all of them have 4 right angles for example a rhombus does not have any right angles, yet it is still a parellegram so parellegrams don't always need to have 4 right angles.
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A rhombus does not have four right angles. A square has four right angles, as does a rectangle.
A rectangle has four right angles but is not a square.
four equal angles
No, on the contrary an octagon has no right angles
A square or a rectangle both have four interior right angles.