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標題:
一條好easy的 maths題~
發問:
http://dzhk.net/hk/upload/images/1184163010.tmp 不白明45怎樣來~ http://dzhk.net/hk/upload/images/1184163102.JPG
最佳解答:
a ) 3 x 10000cm = 300 m So the actual length of PQ is 300m. b ) Vertical distance = 250 m - 225 m = 25 m , horizontal distance = 300m, so the gradient = 25 / 300 = 1 / 12 c ) The horizontal distance remains unchanged ( i.e. 300m ), but the vertical distance now becomes 20 m higher, so it is : 25 + 20 = 45m Hence the angle of depression at the top of the tower : 45 / 300 = tan x x = 8.53* ( cor. to 3 s.f. )
其他解答:
一條好easy的 maths題~
發問:
http://dzhk.net/hk/upload/images/1184163010.tmp 不白明45怎樣來~ http://dzhk.net/hk/upload/images/1184163102.JPG
最佳解答:
a ) 3 x 10000cm = 300 m So the actual length of PQ is 300m. b ) Vertical distance = 250 m - 225 m = 25 m , horizontal distance = 300m, so the gradient = 25 / 300 = 1 / 12 c ) The horizontal distance remains unchanged ( i.e. 300m ), but the vertical distance now becomes 20 m higher, so it is : 25 + 20 = 45m Hence the angle of depression at the top of the tower : 45 / 300 = tan x x = 8.53* ( cor. to 3 s.f. )
其他解答:
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