Parallelograms are squares is sometimes true. Squares are parallelograms is always true. Rhomboids are parallelograms is also always true. So not all parallelograms are squares but some are.
Sometimes they are.
Sometimes * * * * * Never. A parallelogram has two pairs of equal angles opposite one another. A trapezoid does not.
-- A parallelogram is always a quadrilateral. -- A quadrilateral is sometimes a parallelogram.
Yes. Parallelograms are always quadrilaterals.
Not all parallelograms are rectangles. A parallelogram is a shape with two parallel sides. Sometimes a parallelogram is a rhombus, trapezoid or a square.
Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.
Some parallelograms are squares - the ones which are equiangular (have equal angles) and are equilateral (have equal side lengths). All squares are parallelograms, but only some parallelograms are squares.
opposite angles of all parallelograms are always equal.