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h=3a
P=36
P=a*h
36=a*3a
36=3a²
a²=12
a=√12
a=2√3
a= x= 2√3
h= 3x= 3*2√3= 6√3
P= ah
x*3x=36
3x2=36/:3
x2=12/ √
x= √4*3
x=2√3
Odp. Długość boku wynosi 2√3