Question

why square can be thought of as a special rectangle

Answer 1

it is thought as a special rectangle because a rectangle also has 90 degree angles and opposit sides are equal but square has same sides and also has 90 degree

Answer 2

square can thought of as a special rectangle because square fulfills all the properties of the rectangle but have some additional properties such as the all sides are equal and the diagonals are equal and bisect at 90 degree