A Quadrilateral has four-sides, it is 2-dimensional (a flat shape), closed (the lines join up), and has straight sides.
We have special types of quadrilaterals which are,
1) Rectangle
2) Square
3) Rhombus
4) Parallelogram
5) Trapezium
6) Kite
Some types are also included in the definition of other types! For example a square, rhombus and rectangle are also parallelograms.
An isosceles trapezoid has left and right sides of equal length that join to the base at equal angles.
Below is the diagram of an Isosceles trapezoid
