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P=(a²√3)/4
(a²√3)/4 = √3 /*4
a²√3 = 4√3 /:√3
a²=4
a=2 [cm]
√3=a^√3/4
4√3=a^√3
a^=4
a=2 cm
P= (a²√3)/4
P=√3
(a²√3)/4=√3 /×4
a²√3=4√3 /÷√3
a²=4
a=√4=2