r

r

r = 1.1 (slider from 0.1 to 3, step 0.1)
O = Intersect(xAxis, yAxis)
c = Circle(O, r)
A = Point(c)
B = Point(c)
t_α = CircleSector(O, A, B)
α = Angle(A, O, B)
αrad: (π * α / 180 / °)
αr: (α * r)
a = Segment(O, A)
b = Segment(O, B)
ív_α = CircleArc(O, A, B)
szöveg1: "K_{kör}=2·r·\pi = " + (LaTeX[((2 * r) * π)]) + "\ (cm)\\
T_{kör}=r^2·\pi=" + (LaTeX[(r^(2) * π)]) + " \ (cm^2)"
szöveg2: "i_α=r·α(rad)=" + (LaTeX[r]) + "·" + (LaTeX[αrad]) + "=" + (LaTeX[(r * αrad)]) + " \ (cm) \\
t_α=\frac{i_α·r}{2}=\frac{\alpha·r^2}{2}=\frac{" + (LaTeX[αrad]) + "·" + (LaTeX[r]) + "^2}{2}=" + (LaTeX[(αrad * r^(2) / 2)]) + " \ (cm^2)"