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The formula for the area of a tirangle is base x height divided by 2 (bh/2). You can use the formula to find the length of the base:

(b x h)/2 = area (next substitute with the known numbers)

(b x 18)/2 = 216 (next divide both sides of the equation by 2)

b x 18 = 108 (next divide both sides by 18 to find the base)

b = 6

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