There are six basic types of quadrilaterals: 1) rectangle, 2) square, 3) parallelogram, 4) rhombus, 5) trapezoid, and 6) kite. Each one of them and their basic properties are given below:
Quadrilaterals only have one side more than triangles, but this opens up an entire new world with a huge variety of quadrilateral types. Learn about it here.
Quadrilaterals are two-dimensional four-sided polygons on a plane. Quadrilaterals have the following properties: the interior angles add up to 360°. The following diagram shows the properties of some quadrilaterals: square, rectangle, parallelogram, trapezoid, rhombus, kite.
So a quadrilateral is a four-sided polygon. Since it is a polygon, you know that it is a two-dimensional figure made up of straight sides. A quadrilateral also has four angles formed by its four sides. AB, BC, CD and DA are the sides and A, B, C and D are the vertices of the quadrilaterals.
Quadrilaterals are widely studied in geometry. They are often categorized further based on their angles and sides. A parallelogram is a quadrilateral with two pairs of parallel sides. The opposite angles and sides of a parallelogram are congruent. A rectangle is a quadrilateral with four right angles.
Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.
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 parallelograms. See below for more details. Let us look at each type in turn: A rectangle is a four-sided shape where every angle is a right angle (90°).