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h=18cm
h = a√3/*2
36cm=a√3 /*√3
36√3cm=a*3 // 3
a=12√3cm
Obw = 6*a = 6*12√3cm=72√3cm
Wzór na pole sześciokąta - P = 3a²√3/2
P= 3*12√3*√3/2=3*12*3/2=108/2=54
P=54cm²