Area of an equilateral triangle is s*(sqrt 3)/2, where s is the length of a side, or:
area = s * 0.866666. . .
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Perimeter of equilateral triangle: 24 units Area of equilateral triangle: 27.713 square units rounded to three decimal places
In our example, the area of the equilateral triangle is 1/6 of the area of the regular hexagon
If an equilateral triangle and a square have equal perimeters, then the ratio of the area of the triangle to the area of the square is 1:3.
8.7
There is only one basic shape for an equilateral triangle. The area can only vary as the length of the sides vary.