Question

find the area of an equilateral triangle with side 18 cm​

Answer 1

√3/4a2

√3/4 ×18×18

140.296

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Answer 2

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$= \frac{ \sqrt{3} \times {a}^{3} }{4} . \\ \\ = \cancel \frac{ \sqrt{3} \times (18) }{4} . \\ \\ = \frac{9 \sqrt{3} }{2} . \\ \\ = 140.3.$

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