Gonyonhatu: Tichataura pamusoro pemarudzi egonyonhatu; aya anotumidzwa mazita zvichienderana nekupimwa kwemativi uye gonyo dziri paari. Kune gonyonhatu tsazakose (equilateral triangle) - iri rine mativi ose akaenza uye gonyo nhatu dzose dzakaenzana. Kune gonyonhatu mutseyekwa (scalene triangle) - iri rine mativi ose ane nhambwe dzakasiyana uye gonyo nhatu dzose dzakasiyana. Hazvinei gonyonhatu mutseyekwa agara nedivi ripi anotaridzika seanorerekera (kana kuwandira) kune rimwe divi nguva dzose. Kune gonyonhatu tsazamaviri (isosceles triangle) - iri rine mativi maviri akaenzana, negonyo mbiri dzakaenzana. Kunoitawo gonyonhatu yemutwi (right-angled triangle) - iyi ine mativi maviri anosvika pamukwava une gonyo re 90o.