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Regular decagon
Regular polygon 10 annotated.svg
A regular decagon
TeepRegular polygon
Edges an vertices10
Schläfli seembol{10}
Coxeter diagram{{{p10-CD1}}}
Symmetry groupD10, order 2×10
Internal angle (degrees)144°
Dual polygonself
Propertiesconvex, cyclic, equilateral, isogonal, isotoxal

In geometry, a decagon is ony polygon wi ten sides an ten angles, an uisually refers tae a regular decagon, havin aw sides o equal length an each internal angle equal tae 144°. Its Schläfli seembol is {10}.