Teorema: Num triângulo qualquer a soma dos ângulos internos é sempre 180°.

B = (5.82, 3.22)
D = (9.316232558139534, 1.7053953488372104)
E = (6.180893510572298, 3.312739767569128)
F = (2.5724592867186313, -2.135487680277531)
G = (4.760898408960026, -0.7185419596995004)
H = (5.225420786509638, -2.4505903871492594)
J = (7.992225844912366, 1.2716873953161263)
K = (10.742767537799134, 1.964913350433929)
A = (9.031044869925424, 0.5097515139633059)
C = (10.296611848069325, 3.341569823214374)
L = (8.706126255678553, 2.552609983648071)
M = (8.015001026479402, 1.5069464875220824)
N = (9.855009753568051, 1.7807038835035645)
pol1, n, l, m = Polygon(L, M, N)
α = Angle(N, M, L)
γ = Angle(L, N, M)
β = Angle(M, L, N)
Pontopol1 = PointIn(pol1)
Textopol1: "Área de  " + (Name[L]) + "" + (Name[M]) + "" + (Name[N]) + " = " + pol1 + ""
s: α + β + γ
texto2: "Prova: " + α + "+" + β + "+" + γ + "=" + s + ""
I = (9.821551159882778, 3.8512147860652335)
O = (10.316138551265913, 3.7842781466299225)
pol2, a, b, c, d, e, P, Q, R = Polygon(I, O, 5)
pol3, f, g, h, i, j, k, p, S, T, U, V, W = Polygon(P, O, 7)
pol4, q, r, t, a_1, b_1, c_1, Z, A_1, B_1, C_1 = Polygon(W, V, 6)