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Start by finding the area of this shape, if it were a whole.
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Since one side is 12 cm and the other side is 18 cm, we know this is not a square. This is a rectangle when complete!
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I bet if we compute the area of this shape as a whole rectangle, and then half that answer, we will get our answer!
Rectangular shape
volume = length * width * height
volume = 18cm * 12cm * 9cm
shape in question volume = (1/2)(18cm * 12cm * 9cm)
volume = 972cm
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