The perimeter of an equilateral triangle is 12 unit.
Let us consider that, each side of equilateral triangle is a . Because in equilateral triangle each sides are equal in length.
Apply Pythagoras theorem,
[tex](2\sqrt{3} )^{2}+(\frac{a}{2} )^{2}=a^{2} \\\\12+\frac{a^{2} }{4} =a^{2}\\\\a^{2}-\frac{a^{2} }{4} =12\\\\\frac{3}{4}a^{2}=12\\\\a^{2}=16\\\\a=4[/tex]
The perimeter of an equilateral triangle = [tex]3*a[/tex]
= [tex]3*4=12unit[/tex]
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