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x-krawędź boczna
P= (a²√3)/4 a>0
(a²√3)/4= 36√3
(a²√3) = 144√3
a²=144
a=12
h=(a√3)/2= 12√3 / 2 = 6√3
tg60⁰ = √3
tg60⁰=h/H
√3=(6√3) / H
H=6
6²+(6√3)²=x² x>0
x²= 36+108 =144
x=12