 Boyeba ba mesures ya angle ya triangle oyo epesami.
Engebene mokakatano, bolai ya mipanzi ya triangle ezali 14, 3, mpe 15 unités. Lokola 15 ezali ngambo ya monene, tokoki kosalela Loi ya Cosines mpo na koluka angle oyo ezali opposé na 15. Tika ete ezala angle C. Ba angles mosusu ekoki kobengama A mpe B. Tika a=14, b=3, c=15 , bongo cos(C) = (a2 + b2 - c2) / (2ab) = (142 + 32 - 152) / (2 * 14 * 3) = -0,3571428571 C = arccos(-0,3571428571) = 111,8° Sikawa, na luka angle A, tokoki kosalela Loi des Sines, oyo elobi ete rapport ya mesure ya moko ya ba angles ya triangle na longueur ya côté opposé na angle wana ezali ndenge moko pona ba angles nionso misato ya triangle. Na yango, a/lisumu(A) = c/lisumu(C) => 14/lisumu(A) = 15/lisumu(111,8°) Soki tosilisi mpo na lisumu(A), tokokuta lisumu(A) = (14 *lisumu( 111.8°))/15 = 0,9235687435 Na yango, A = arcsin(0.9235687435) = 67,4° Pona koluka angle B tokoki kosalela ete somme ya ba angles ya triangle ezali 180°, sima A + B + C = 180° => B = 180° – A – C = 180° – 67,4° – 111,8° = 0,8° Na yango, ba mesures ya angle ya triangle oyo epesami ezali 67,4°, 0,8°, na 111,8°.