Question

Which statement is true?

All quadrilaterals are parallelograms because they have 4 sides.
All trapezoids are parallelograms because they have 1 pair of parallel sides.
All squares are parallelograms because they have 2 pairs of parallel sides. All polygons are parallelograms because they have straight lines and closed sides.

Answer 1

In geometry, a parallelogram is defined as a simple quadrilateral with two pairs of parallel sides, with opposite sides are of equal length and the opposite angles of equal measure. From these descriptions alone, one statement is true-- All squares are parallelograms because they have 2 pairs of parallel sides.