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Pp=Pc-Pb=126√3-90√3=36√3
a²√3;4=36√3/:√3
a²=36×4
a²=144
a=12cm=krawedź podstawy
h sciany:
pole 1 sciany=½ah
30√3=½×12h
h=30√3:6
h=5√3cm= wysokosć sciany bocznej