There are special types of quadrilateral: Some types are also included in the definition of other types! For example a square, rhombus and rectangle are also parallelogr… See more

the little squares in each corner mean "right angle" A rectangle is a four-sided shape where every angle is a right angle(90°). Also opposite sides are paralleland of equal length.… See more

the little squares in each corner mean "right angle" A squarehas equal sides (marked "s") and every angle is a right angle (90°) Also opposite sides are parallel. A square also fits th… See more

A rhombusis a four-sided shape where all sides have equal length (marked "s"). Also opposite sides are parallel andopposite angles are equal. Another interesting thing is that the d… See more