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The formula for the area of a triangle is: 1/2bh=a a. To work the problem, substitute the numbers that you have into the equation: 1/2(9)h=81 b. With equations, what you do to one side, you must do to the other. 1. Since the first half of the equation really states: 1(9)h/2, you can multiply it by 2/1 and get rid of the 2 on the bottom (cross-dividing). 2. Since you multiplied the first half of the equation by 2/1, you must now multiply the second half by this number: 81(2)=162 c. Your equation should now look like this: 9h=162 d. Divide both sides of the equation by 9 to isolate the variable (h). e. Your final answer should be 81. f. To check: 1/2(9)18=(?)81 162/2=81 81=81

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