Área del sector circular

Deslice el puntero para generar distintos 
radios o ángulos.

Área del sector circular

A = Intersect(xAxis, yAxis)
r = 4 (slider from 1 to 6, step 1)
α = 1.5707963267948966 rad (slider from 0 to 360*°, step 1*°)
c = Circle(A, r)
B = Intersect(c, xAxis, 1)
a = Segment(A, B)
B' = Rotate(B, α, A)
b = Segment(A, B')
d = CircleSector(A, B, B')
β = Angle(B, A, B')
texto1: "r=" + (LaTeX[r]) + ""
texto3: "A=\frac{\pi·r^{2}·\alpha}{360°}=\frac{3.14·" + (LaTeX[r]) + "^{2}·" + (LaTeX[α]) + "}{360°}=" + (LaTeX[d]) + ""