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r=?
z cos60°mamy
2r:d=cos60°
2r/8=1/2
2r=4
r=2cm
α - kąt = 60⁰
d - średnica podstawy
d/l = cos60⁰
d = lcos60⁰ = 8 razy 1/2 = 4
r - promień = d/2 = 4/2 = 2