Luka etando ya triangle oyo ezali na ba sommets (2, -3), (6, 10) na (-3, 7).
 Etando ya triangle ekoki kotangama na kosalelaka formule oyo : | (Ax * (Na - Cy) + Bx * (Cy - Ay) + Cx * (Ay - Na)) / 2 |, esika Ax, Ay, Bx, By, Cx, mpe Cy ezali komonisa ba coordonnées ya ba sommets misato ya triangle oyo ezali na kati. Mpo na triangle oyo ezali na ba sommets (2, -3), (6, 10), mpe (-3, 7), tokoki kopesa A=(2, -3), B=(6, 10), mpe C=( -3, 7) . Soki to substituer ba valeurs oyo na formule, tozuaka oyo : Area = abs((2 * (10 - 7) + 6 * (7 + 3) + (-3) * (-3 - 10)) / 2) = abs ((6 + 60 - 39) / 2) = abs(27/2) = 13,5 Na yango, etando ya triangle oyo ezali na ba sommets (2, -3), (6, 10) pe (-3, 7) ezali 13,5 ba unité carrées.