angle nul

angle obtus

angle droit

angle aigu

angle rentrant

angle plat

angle plein

360°

α = 6.283185307179586 rad (slider from 0*° to 6.28318530717959, step 0.0174532925199433)
A = (8.939618503401363, 0.6774920634920597)
O = (6.291736806292199, 0.6572242272894869)
A' = Rotate(A, α, O)
β = Angle(A, O, A')
a = Ray(O, A)
b = Ray(O, A')
X = Point(b)
Y = Point(a)
c = Circle(O, 1.3)