A triangle with a base of 9 meters has an altitude of 12 meters. Which would give the area of the triangle?

A. 3.14 x 9 x 12

B. 1/2 x 9 x 12

C. 2 x (9 + 12)

D. 2 x 9 x 12

E. 1/2 x 9 x 1/2 x 12

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