The correct statements are:
A square is a type of parallelogram, which is a special quadrilateral. This quadrilateral has equal side length and interior angles measure 90∘. Every square is a parallelogram.
A quadrilateral is a four-sided polygon with four angles. The most common types are the parallelogram, rectangle, square, trapezoid, and the rhombus.
A trapezoid is a type of quadrilateral. A quadrilateral with exactly one pair of parallel sides is called a trapezoid.
(tìm tập xác định)