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α -kąt ze średnicą = 60°
h - wysokość walca = ?
h/k = sin60° = √3/2
h = d * √3/2 = 12√3 * √3/2 = 6 * 3 = 18
d - średnica podstawy = ?
d/k = cos60° = 1/2
d = k * 1/2 = 12√3 * 1/2 = 6√3
r - promień podstawy = d/2 = 6√3/2 = 3√3