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A quadrilateral whose opposite sides are parallel and congruent?
A square or a rhombus
What is a quadrilateral whose opposite sides are parallel and congruent is called?
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What is a pallelogram?
A parallelogram is a quadrilateral whose opposite sides are parallel and has no right angles
Is a parallelogram symmetrical?
In short, yes. A parallelogram is a quadrilateral with opposite sides parallel (and therefore opposite angles equal). A quadrilateral with equal sides is called a rhombus, and a parallelogram whose angles are all right angles is called a rectangle. And, since a square is a degenerate case of a rectangle, both squares and rectangles are special types of parallelograms.
Why is a rhombus a parallelogram?
A parallelogram is a 4-sided figure whose opposite sides are parallel. and opposite angles are the same. The opposite sides of a rhombus are parallel, therefore it's a parallelogram. Its sides also happen to be all the same length, which isn't required in a parallelogram, and that's why it's a special kind of parallelogram and has a special name. However, a parallelogram is NOT a rhombus!
