Saddexagalku wuxuu leeyahay saddex xaglood, wadarta xagalaha saddexagalkuna mar walba waa 180°.

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.

• Saddex-xagalka violet

Aagga

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

Wareegyada

${\displaystyle Wareegyada=s1+s2+s3\,}$