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The formula for the area of a triangle is (1/2)bh.

Filling in the known numbers results in:

18 = (1/2)b(9)

simplify:

18 = 4.5b

divide both sides by 4.5:

b = 4, so the length of the base is 4 m.

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Q: What is the length of the base of a triangle with the height 9 m and area 18 m?
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