3 ms·

You do realize that, inch for inch, a circle has the highest area/perimeter ratio, right?

• tzs 12y ago
  There are at least two constraints on wristwatch size. Let the Z axis be in the direction of the thickness of the watch. Let the X axis be in the direction parallel to your arm. Let the Y axis be perpendicular to the X axis and the Z axis. 1. You do not want it to extend along X axis too far toward the fingers, or it will interfere with moving your hand at the wrist. 2. You do not want to extend too far either way along the Y axis, or it will be too easy to accidentally hit things with it. The point of the post above yours is that if a circle with diameter D is an acceptable size--it doesn't extend too far in the X or Y directions to interfere with your wrist or hit things--then a square of side D will generally also be acceptable. The square will give you more face area than the circle.
• bluthru 12y ago
  Circles are the worst shape if you want to minimize width and height.