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WZÓR: 1/2 A*H
P=1/2 1,3*1,3=0,845
4=3a / 3
a=⁴/₃cm
h=½ a√3
h=½*⁴/₃√3
h=⁴/₆√3
P=½ah
P=⁴/₃*½*⁴/₆√3
P=¹⁶/₃₆√3
P=⁴/₉√3