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Area of an Equilateral Triangle

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Calculate the area, perimeter, and height of an equilateral triangle from the length of one side.
Side length a
Area S 
Perimeter L 
Height h 
\(\normalsize Equilateral\ triangle \\ (1)\ area:\hspace{50px} S={\large\frac{a^2 \sqrt{3}}{4}}\\ (2)\ perimeter:\ L=3a\\ (3)\ height:\hspace{40px} h={\large\frac{a\sqrt{3}}{2}}\\\)

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Area of an Equilateral Triangle | Keisan