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Please help this is due

Please help this is due-example-1
User Lopezbertoni
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\text{Area of equilateral triangle ABC}\\ \\=(\sqrt 3)/(4) BC^2\\\\=\frac{\sqrt 3}4 \cdot 12^2\\\\=(144\sqrt 3)/(4)\\\\=36\sqrt 3

User NeilA
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