A = (1, 1)
B = Point(xAxis)
C = Point(yAxis)
D = Intersect(xAxis, yAxis)
Vieleck1, d, b, a, c = Polygon(D, B, A, C)
e = Circle(D, A)
E, W = Intersect(e, xAxis)
l = 1 (slider from 1 to 20, step 1)