[size=150]The perimeter (p) of a Quadrilateral refers to the total length of the sides of the Quadrilateral.[/size]

[u][b][size=150]Parallelogram and [u][b][size=150]Retangle[/size][/b][/u][/size][/b][br][br][/u]Area: [math]A=bh[/math] (b=base, h=height)[br]

[b][u][size=150]Trapezium[/size][/u][/b][br][br]Area: [math]A=\frac{\left(a+b\right)\cdot h}{2}=\frac{1}{2}\left(a+b\right)\cdot h[/math] (a and b are parallel sides, h=height)