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trójkąt jest równoboczny
P=a²√3:4
100√3=a²√3:4 /:√3
100=4a²
a=5
H²=a²-(½a)²
H²=25-6,25
H²=18,75
H=2,5√3
Pp=πr²
r=½a=2,5
Pp=6,25π
V=PpH=15,625π√3
P=Pp+πrl
l=a=5
P=6,25π+25π=31,25π
k=2
P`=4p=125π
V`=8V=125π√3