-- opposite pairs of sides are equal -- opposite pairs of sides are parallel -- interior angles are right angles -- sum of the interior angles is 360° -- opposite angles are supplementary -- adjacent angles are supplementary -- all of them have at least 2 lines of symmetry (some have 4)
You get this because whenever there are three digits after a number you add a comma as seen in the number there are three digits after 85 so you add a comma.
