Right angles can’t be on the outside of the shape, and I don’t think the two angles on the far right can possibly be 90 degrees. They might be like 89.99 degrees for a split second, but never fully 90.
Rounding is banned?
Yes. Especially when it comes to geometric shapes. Congruence must be down to the farthest decimal.
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.
Also not a square then. The angles are infinitesimally curved, it's impossible to detect with the resolution of your iPhone, however. https://image.nostr.build/29ce8f075fdf0511ff37206e8d331aa29d2211e619581b3bbf05bddf868caf0d.jpg