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Estimate the length of rope in the spiral. The width of the boards is 8 cm. Explain how you get your result
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A. Estimate the length of rope in the spiral. The width of the boards is 8 cm. Explain how you get your result. In the picture, the width of the 2nd to last board = 1 cm The width of each board in real size = 8 cm Therefore, the ratio of length at the 2nd to last board: real size is 1: 8 The width of the rope on paper = 0.25 cm Therefore, the width of the rope = 0.25 cm x 8 = 2 cm. Let the diameter of the spiral = 6.5 board widths Then the diameter of the spiral = 6.5 x 8 cm = 52 cm The length of the rope in the spiral = ? (diameter of most outer loop + diameter of 2nd most outer loop + diameter of 3rd most outer loop + ... + diameter of 12th most outer loop) Diameter of most outer loop = diameter of...
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