

$$2p = B + b + S_{1} + S_{2}$$
Perimeter
$$A = \frac{\left(B + b \right) \times h}{2}$$
Area
$$B + b = \frac{2A}{h}$$
Sum of bases
$$h = \frac{2A}{B + b}$$
Height
$$B + b = 2p  S_{1}  S_{2}$$
Sum of bases
Definition
A trapezoid is a quadrilater with two parallel sides.
Properties
 A trapezoid is a four sides polygon with two parallel sides
 The parallel sides are called bases, while the other two are called oblique sides. In a trapezoid we identify the bases as longer base and shorter base
 Generic Trapezoid's formulas are valid for any trapezoids
Generic Trapezoid Formulas
Data  Formula 

Perimeter  2p = B + b + S_{1} + S_{2} 
Area  A = [(B + b) × h] / 2 
Height  h = (2 × A) / (B + b) 
Sum of bases  B + b = (2 × A) / h 
Sum of bases  B + b = 2p  S_{1}  S_{2} 