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A square picture

A square picture is glued to a square piece of construction paper. The Construction paper is 4 times the area of the square picture mounted on it. The construction paper has a side length of 30cm What is the side lenght of the picture ?

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回應 Kiyoshi511 第 1 篇文章

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终于有了
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thanks alot!!!!!!!!! waiting so long:)
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