一題math help me
2007-02-27 3:39 am
回答 (1)
2007-02-27 4:01 am
✔ 最佳答案
a) Let 梯子的頂端與地面的水平的距離是 hh/5 = cos 20°
h = 4.698m (to 3d.p.) or h = 4.70 (to 3 sig.fig.) (因為唔知答案要幾個位)
b) (h-2)/5 = sinθ
θ = 32.663° (to 3d.p.) or θ = 32.7° (to 3.sig.fig.)
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收錄日期: 2021-04-23 16:42:33
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