Answer: True
Step-by-step explanation:
A rectangle has all four angles that are 90 degrees. The side lengths may or may not all be the same length; however, we do know that the opposite sides are the same length.
A square is a special type of rectangle where all four sides are the same length and all angles are 90 degrees.
If a figure is a square, then it is automatically a rectangle, but not the other way around.