Phương trình đường tròn

(x-a)² + (y-b)² = R²

a = 3.3 (slider from -10 to 10, step 0.1)
b = 2.8 (slider from -10 to 10, step 0.1)
R = 2.4 (slider from 0 to 15, step 0.1)
C: (x - a)^(2.0) + (y - b)^(2.0) = R^(2.0)
I = Center(C)
M = Point(C)
c = Segment(I, M)
d = OrthogonalLine(I, xAxis)
e = OrthogonalLine(I, yAxis)
A = Intersect(e, yAxis)
B = Intersect(e, d)
D = Intersect(xAxis, d)
f = Segment(B, A)
g = Segment(B, D)