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pole podstawy:πr²
πrl=2πr²/:πr
l=2r
cos 60⁰=r:2r=½
tworzaca jest nachylona pod katem 60⁰, wskazuje na to cos k.ata 60⁰
πrl=2πr² /:r
l=2r
cosα=r/l (/ kreska ułamkowa)
cosα=rl/2r
cosα=1/2
α=60°