owldoesthings owldoesthings
  • 26-03-2018
  • Mathematics
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find the area of an equilateral triangle (regular 3-gon) with the given measurement 9-inch A=sq. in.

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jdoe0001 jdoe0001
  • 26-03-2018
assuming is a 9 inch side.

[tex]\bf \textit{area of an equilateral triangle}\\\\ A=\cfrac{s^2\sqrt{3}}{4}\qquad \begin{cases} s=length~of\\ \qquad a~side\\ -------\\ s=9 \end{cases}\implies A=\cfrac{9^2\sqrt{3}}{4}\implies A=\cfrac{81\sqrt{3}}{4}[/tex]
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