S ocн= πR²=4π
S бок пов=4π*3=12π=πRL
L= =6
cosα==
α=70,5°
по т пифагора:
H²=36-4=32
H=5,65685
V=*π*R²*H=7,5824
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S ocн= πR²=4π
S бок пов=4π*3=12π=πRL
L= =6
cosα==
α=70,5°
по т пифагора:
H²=36-4=32
H=5,65685
V=*π*R²*H=7,5824