# What is the area of an equilateral triangle of side length 20 cm?

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KillerBunny
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Nov 26, 2015

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Referring to this image,

http://areeweb.polito.it/didattica/polymath/htmlS/argoment/ParoleMate/Gen_08/Img/TriangoloEquilatero%20(11)png

we know that

This means that the height cuts

This means that, for example,

Since we know the base and the height, then the area is

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