Huỳnh Anh Phương
01/08/2018 at 12:58-
The 1st shape has 3 lines. The 2nd shape has 4 lines, and so on. So the 8th shape has 10 lines. Because each line is 8cm, the perimeter of the 8th shape is: \(8\times10=80\left(cm\right)\)
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