if the area of an equilateral triangle is 81 under root 3 find its perimeter
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area of an equilateral triangle is (√3/4)×a^2
where a is side of the triangle
81√3=(√3/4)a^2
81×4=a^2
324=a^2
a=18
the perimeter of equilateral triangle is 3a
3×18=54
where a is side of the triangle
81√3=(√3/4)a^2
81×4=a^2
324=a^2
a=18
the perimeter of equilateral triangle is 3a
3×18=54
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