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25 July, 19:52

If both the base and height of a triangle are made nine times as long, how many times the area of the original figure is the area of the new figure?

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  1. 25 July, 19:54
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    To start: A = 1/2bh

    Now by increasing both the width and height by 9, you get: A = 1/2 (9b) (9h) = 1/2 (81) bh

    You can see that the increase in area is 81 times the original.
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