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α=360-90=270cm
łuk=270:360×2π×12=18π
18π=2πr/:2π
r=9
l=12cm
h=√12²-9²=√144-81=√63=3√7
średnica=2r=2×9=18cm
wysokosć=3√7cm
α =360-90=270cm
Łuk=270:360×2π×12=18π
18π=2πr/:2π
R=9
L=12cm
H =√12²-9²=√144-81=√63=3√7
średnica=2r=2×9=18cm
wysokosć=3√7cm