Heptagon
| Heptagon Rheolaidd | |
|---|---|
 Heptagon Rheolaidd | |
| Ymylon a fertigau | 7 |
| Symbol Schläfli | {7} |
| Diagram Coxeter–Dynkin |   
|
| Grŵp cymesuredd | Deuhedrol (D7) |
| Arwynebedd (gyda t=hyd yr ymyl) |
|
| Ongl mewnol (gradd) |
128.5714286° |
Mewn geometreg, mae heptagon yn bolygon sydd â saith ochr a saith ongl.
| Polygonau |
|
Triongl | Pedrochr | Pentagon | Hecsagon | Heptagon | Octagon | Nonagon | Decagon | Hendecagon | Dodecagon | Triskaidecagon | Tetradecagon | Pentadecagon | Hexadecagon | Heptadecagon | Octadecagon | Enneadecagon | Icosagon | Chiliagon | Myriagon |
