A parallel is a quadrilateral in i beg your pardon both pairs of the contrary sides space parallel .

A parallelogram also has the adhering to properties:

the contrary angles space congruent; the contrary sides are congruent; surrounding angles are supplementary;

A rectangle is a parallelogram with 4 right angles, so every rectangles are additionally parallelograms and also quadrilaterals. ~ above the other hand, no all quadrilaterals and parallelograms space rectangles.

A rectangle has actually all the properties of a parallelogram, plus the following:

The diagonals space congruent.

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

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

The diagonals intersect at appropriate angles.

A square can be defined as a rhombus i beg your pardon is likewise a rectangle – in other words, a parallelogram with 4 congruent sides and four best angles.

A trapezoid is a square with exactly one pair the parallel sides. (There might be some confusion around this word depending upon which country you"re in. In India and Britain, they say trapezium ; in America, trapezium usually means a quadrilateral through no parallel sides.)

one isosceles trapezoid is a trapezoid whose non-parallel sides space congruent.

A dragon is a square with precisely two pairs of surrounding congruent sides. (This definition excludes rhombi. Some textbooks to speak a kite has at least two pairs of adjacent congruent sides, so a rhombus is a special instance of a kite.)

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

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## Venn chart of Quadrilateral classification

The adhering to Venn Diagram reflects the inclusions and also intersections that the various varieties of quadrilaterals.