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R=2/3h
4√3=(2/3a√3)/2 /2
8√3=2/3a√3 /:√3
8=2/3a /3/2
12=a
P podstawy=a^2√3/4
P=144√3/4
P=36√3
R/l=cos60
4√3/l=1/2
4√3=1/2*l
8√3=l , l-dł.krawędzi bocznej
H/R=tg60
H=√3 R
H=√3*4√3
H=12
V=1/3 P*H
V=1/3 *36√3*12
V=144√3