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5.7735 cm is the length of a side so 1/2 x base x Height should give you an answer.

Remember, the apothem makes two mirrored 30 60 right triangles...Pythagoras will tell you how to find the hypotenuse...that will be the unknown side of the equilateral.

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Q: What is the area of an equilateral triangle with an apothem of 5cm?
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