Compute rectangle diagonal from width w and height h using d = √(w² + h²).
矩形对角线长度。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Rectangle diagonal | d = √(w² + h²) | Pythagorean theorem |
| Area | A = w·h | Rectangle area |
| Perimeter | P = 2(w + h) | Rectangle perimeter |
| Screen sizing | Inches measure the diagonal | Display industry |
| Aspect ratio | 16:9 and 4:3 common | Display standards |
| Units | Consistent length units | Dimensional rules |