So, how do you join the parallelogram party? Well, it's quite simple really - if a quadrilateral has opposite sides that are parallel, then it's a parallelogram. Easy peasy, right? But, here's the catch - just because it's a quadrilateral, doesn't mean it's automatically a parallelogram.
Let's take a square, for example. A square is a type of quadrilateral that has all sides of equal length, and all internal angles are right angles (90 degrees). But, is it a parallelogram? You bet your bottom dollar it is! Because, the opposite sides of a square are parallel to each other.
Now, let's talk about rectangles. A rectangle is similar to a square, but it doesn't have all sides of equal length. However, it's still a quadrilateral with opposite sides that are parallel, so it's also a parallelogram. See, this isn't so hard, is it?
