A ** parallelogram ** is a square in i m sorry both pairs of the contrary sides room parallel .

A parallelogram also has the complying with properties:

the contrary angles room congruent; the opposite sides room congruent; adjacent angles are supplementary; A ** rectangle ** is a parallelogram with 4 right angles, so all rectangles are additionally parallelograms and quadrilaterals. Top top the other hand, not all quadrilaterals and parallelograms room rectangles.

A rectangle has all the nature of a parallelogram, to add the following:

The diagonals are congruent.

A ** rhombus ** is a parallel with four congruent sides. The plural of rhombus is ** rhombi ** . (I love that word.)

A rhombus has all the nature of a parallelogram, add to the following:

The diagonals crossing at ideal angles. A ** square ** deserve to be identified as a rhombus i m sorry is also a rectangle – in various other words, a parallel with 4 congruent sides and also four appropriate angles.

A ** trapezoid ** is a square with exactly one pair that parallel sides. (There may be part confusion around this word depending on which country you"re in. In India and also Britain, they to speak ** trapezium ** ; in America, trapezium usually way a quadrilateral through no parallel sides.)

an ** isosceles trapezoid ** is a trapezoid whose non-parallel sides room congruent.

A ** kite ** is a quadrilateral with specifically two pairs of nearby congruent sides. (This definition excludes rhombi. Some textbooks say a kite contends least two pairs of adjacent congruent sides, therefore a rhombus is a special instance of a kite.)

A ** scalene ** quadrilateral is a four-sided polygon that has no congruent sides. Three instances are presented below.

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## Venn diagram of Quadrilateral group

The adhering to Venn Diagram mirrors the inclusions and intersections the the various types of quadrilaterals.