yes
Each (interior) angle in a rectangle is 90 degrees.
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Yes- they are all right angles.
They can, but usually they are not. All the angles will be equal only if your parallelogram is a rectangle.
A rectangle is a parallelogram in which all four vertex angles equal 90°.
Not unless all angles are also equal. A rhombus is a parallelogram with all sides equal. A rectangle is a parallelogram with all angles equal. A square is a rhombus with all angles equal which is a parallelogram with all sides equal and all angles equal.
A square. * * * * * Or a rectangle.