Saddex-xagal ama Sadax-gees. Saddexagalku wuxuu leeyahay saddex xaglood, wadarta xagalaha saddexagalkuna mar walba waa 180°.

Simane
Labaale
Fiiqane

Adeegsada

Saddex xagalka ayaa aad faa'iido u leh. Barashada joomatari ee la xidhiidha saddexagalka waxa loo yaqaan tirignoometeri. Dadka qaar ayaa noloshooda oo dhan ku qaatay barashada saddexagalka si loogu isticmaalo tirignoometeri.

Kumbuyuutarrada casriga ahi waxay inta badan adeegsadaan saddex xagal si ay u sameeyaan sawirro garaafyo ama qaabab aad u adag.

Sido kale eeg

Saddex-xagalka violet

Xisaabi aagga iyo wareegyada

Aagga

Aagga={\frac {1}{2}}.b.h\,

Wareegyada

Wareegyada=s1+s2+s3\,