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False. If both pairs of opposite angles of a quadrilateral are congruent then the quadrilateral is a parallelogram.
It is a parallelogram or an isoangular quadrilateral.
If a quadrilateral has two pairs of opposite congruent sides, then the quadrilateral is a parallelogram.
No. A square fits the classification of a quadrilateral and a parallelogram, but that isn't necessarily the definition. A rhombus is a quadrilateral and a parallelogram, and so are other irregular quadrilaterals. The correct definition would be a parallelogram and a quadrilateral with four right angles and all equal sides.
no it is not