Suma de ángulos interiores:

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m∡A

m∡B

α = 1.0471975511965976 rad (slider from 1*° to 179*°, step 1*°)
β = 1.5707963267948966 rad (slider from 1*° to 179*°, step 1*°)
A = Intersect(xAxis, yAxis)
B = Point(xAxis)
A' = Rotate(A, (-α), B)
γ = Angle(A', B, A)
a = Line(B, A')
B' = Rotate(B, β, A)
δ = Angle(B, A, B')
b = Line(A, B')
C = Intersect(b, a)
polígono1, b_1, a_1, c = Polygon(A, C, B)
ε = Angle(A, C, B)
texto2: "" + (LaTeX[δ]) + "+" + LaTeX[γ] + "+m∡C=180º"
angulo1: δ + γ
texto3: "" + (LaTeX[angulo1]) + "+m∡C=180º"
texto4: "m∡C=180º-" + (LaTeX[angulo1]) + ""
angulo2: 180° - angulo1
texto5: "m∡C=" + (LaTeX[angulo2]) + ""
d = true
e = Segment(A, C)
f = Segment(C, B)
g = Segment(B, A)