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1/R^2 = 4/(h+R)^2
wymnażamy na krzyż i otrzymujemy:
(h + R)^2 = 4R^2
h^2 + 2Rh + R^2 = 4R^2
h^2 + 2Rh - 3R^2 = 0
D(delta) = b^2 - 4ac = (2R)^2 - 4*(-3R^2) = 4R^2 + 12^2 = 16R^2
VD = 4R
h > 0
h = (-2R + 4R)/2
h = R