A

B

C

O

A = (3.078497542359548, 4.181304486716913)
B = (1, 2)
f = Segment(A, B)
C = (4, 2)
g = Segment(B, C)
h = Segment(C, A)
D = Midpoint(A, B)
F = Midpoint(C, A)
i = OrthogonalLine(D, f)
k = OrthogonalLine(F, h)
j = Segment(B, D)
l = Segment(D, A)
m = Segment(A, F)
n = Segment(F, C)
E = Intersect(i, k)
α = Angle(E, D, A)
β = Angle(A, F, E)

Tool: Tool1
Input: A
Output: h, g

B: (x(A), 0)
C: (0, y(A))
g = Segment(A, C)
h = Segment(A, B)