Rhombus
A parallelogram that has 4 congruent sides
Rectangle
A parallelogram that has 4 right angles
Square
A parallelogram that is a rhombus and a rectangle
A parallelogram is a rhombus if and only if…
Its diagonals are perpendicular
A parallelogram is a rhombus if and only if…
Each diagonal bisects a pair of opposite angles
A parallelogram is a rectangle if and only if…
Its diagonals are congruent
A quadrilateral is a rhombus if and only if…
It has 4 congruent sides
A quadrilateral is a rectangle if and only if…
It has 4 right angles