Question

a rectangle is a square? all four of our side have same lengths

Answer 1

A rectangle isn't a square.

Answer 2

A rectangle isn't a square, but

square is a rectangle.

Answer 3

All terrorists are Muslims, but not all Muslims are terrorists.
(sorry for the comparison)

Answer 4

Both a square and rectangle have four 90 degree angles. For a square, all four sides have the same exact length. For a rectangle, the opposite sides are equal, and the adjacent sides are different.