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r=1/3h , gdzie h =a√3/2 , /-kreska ułamkowa
r=3cm a zatem
3cm=1/3*a√3/2/*6
18cm=a√3/:√3
18/√3cm=a
zatem
a =18√3cm/3=6√3cm
b)
R=6cm
gdzie:
R=2/3h=2/3*a√3/2=2a√3/6
6cm=2a√3/6/*6
36cm=2a√3/:2
18cm=a√3/:√3
a=18cm/√3=18√3/3cm=6√3cm