Geometry Course/Polygon/Quadrilateral/Rectangle

Rectangle is a Quadrilaterl that has two long sides parallel and congruent to each other and two short sides parallel and congruent to each other and the four equal angles equal to 90^o

AD // = BC

AB // = DC

${\displaystyle \angle A=\angle B=\angle C=\angle D=90^{o}}$

P = AD + BC + AB + DC = 2x(a+b)

${\displaystyle A=ab}$