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h(podstawy)=a√3/2=12√3/2=6√3
Od wierzchołka podstawy do spodka wysokości mamy (2/3)h=(2/3)*6√3=4√3
H-wys ostroslupa
H²=14²-(4√3)²
H²=196-48
H²=148
H=2√37
hb²(ściany bocznej)=148+12=160 hb=4√10
V=1/3 * 36√3* 2√37=24√111
Pc=36√3+ 3* (1/2* 4√10 *6)=36√3+36√10=36(√3+√10)