The perimeter formula states that the perimeter of a quadrilateral is the sum of all its edges: 

What is the perimeter formula for a quadrilateral?

Length of the boundary of a planar figure

Mathagon

Angle Sum of a Quadrilateral

Rectangles, Squares, Parallelograms and Rhombuses

Trapezoids and Scalene Quadrilaterals

Perimeter 

Area of a Rectangle, Square, Parallelogram and Rhombus

 Calculate the Area of a Rectangle, Square, Parallelogram and Rhombus

Area of a Trapezoid

Calculate the Area of a Trapezoid

Quadrilaterals

Definition

Trapezoids have at least one pair of parallel edges. All the edges of scalene quadrilaterals are of different lengths. This video shows examples of each.: P= a+ b + c + d.  This video shows you how this works.

What Is the Perimeter Formula for a Quadrilateral?