Yes. Especially when it comes to geometric shapes. Congruence must be down to the farthest decimal.
Discussion
I would apply this same critique to the two outside almost right angles as well.
In this realm, zero width lines don't exist. All lines are at least the width of a Planck Length, all points have a minimum volume of the Planck Volume, etc. Practically, lines are typically much wider than these theoretical minimums, which makes finding a true straight line or right angle in nature a rarity.
Which is why geometry operates in the theoretical.