Muchidzidzo chePimanyika, gonyonhatu chiumbwa chine mativi matatu nemagonyo matatu. gonyonhatu chiumbwa chiri pamupanda wegonyozhinji. gonyonhatu rine mikwava A, B, C rinonyorwa sezvizvi, ΔABC. Muchikamu chino tichataura pamusoro pemarudzi egonyonhatu; mhando dzegonyonhatu dzinotumidzwa mazita zvichienderana nekupimwa kwemativi uye magonyo ari pakati paro. 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. Nharaunda yegonyonhatu runonyorwa netsazaniso inoti: Nharaunda = 1/2(b.h) Patsazaniso iri, b, anomirira hwaro hwegonyonhatu; h achimirira hudzamu. Panotsvakwa nharaunda, tinogona kusarudza divi ripi zvaro kuti rive hwaro. Kana tadaro, hudzamu hunenge hwave nhambwe yemutwi unobva pagonyo rakatarisana nehwaro uchinobata pahwaro hwegonyonhatu. Ichi chidzidzo chononzi trigonometric ratio kuEnglish.