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A 10-foot long board is parallel to level ground, and the fulcrum supporting it is at the board's midpoint, as shown in the figure above. If the board is tipped, with the fulcrum remaining at the board's midpoint, so that the board's left end just touches the ground, which of the following is closest to the number of feet that the right end of the board is above the ground?
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· 相关考点
4.3.7 三角形的外心 4.3.8 直角三角形
4.3.7 三角形的外心
4.3.8 直角三角形
以上解析由 考满分老师提供。