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Yukoze
13.8cm square

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Answer: 13.8
Why?
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To find the area of a triangle, you have to use the formula h*b/2. We can see two known lengths, which are 6.9 and 4. The base is 6.9, and the height is 4. So, we have the equation 6.9*4/2. Multiply 6.9 by 4. (6.9 * 4 = 27.6) Now, divide by 2 to find the area. (27.6 / 2 = 13.8) 13.8 is your answer.

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