wszspj2的部落格

標題:

F3 math(20點)

發問:

The scale of the following contour map is1:10 000. If G(250m)H(400m) is a staright road and it is measured 4cm long on the map.Find(a) the gradient of road GH(leave the answers in fraction) (b) the inclination Θ of road GH(give the answers correct to 3 significant figures) (c) the length of... 顯示更多 The scale of the following contour map is1:10 000. If G(250m)H(400m) is a staright road and it is measured 4cm long on the map. Find(a) the gradient of road GH(leave the answers in fraction) (b) the inclination Θ of road GH(give the answers correct to 3 significant figures) (c) the length of road GH

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最佳解答:

vertical distance between G and H=400-250=150m horizontal distance between G and H=4cmx10000=400m (a) gradient of road GH=vertical distance/horizontal distance=150/400=3/8 (b) tanΘ=3/8, Θ=20.6 degrees (3 sig fig) (c) length of road GH=sqrt (150^2+400^2)=427.2 m (4 sig. fig)

其他解答:73E3DC9315AE223D