Finding the Angle given Area of Sector or Arc Length and Radius

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Angle =

A = (0, 0)
h: (Random[2, 10] * 0.5)
B: (h, 0)
f = Segment(B, A)
a = Random(20, 360)
A' = Rotate(A, a, B)
α = Angle(A, B, A')
g = Segment(B, A')
c = CircleArc(B, A, A')
k: α / °
AOS: (((k / 360 * π) * h) * h)
AL: (((k / 360 * π) * 2) * h)
Per: AL + (2 * h)
l: false
b: (2 * h)
text2: "Area of Sector = " + AOS + " cm²"
text3: "Arc Length = " + AL + " cm"
text8: "Radius is = " + h + " cm"
text5: "" + α + ""