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maths
發問:
A helicopter H is observed from two stations A and B on the ground 2000m apart. A B H all line in the same vertival plane.The angles of elevation of H from A and B are 38 and 27 respectively, If the helicopter is h M above the ground. 1) find the length of AB in terms of h, 2) hence find the value of h
最佳解答:
1 ) AB = h / tan 38* + h / tan 28* 2 ) h / tan 38* + h / tan 28* = 2000 tan 28* h + tan 38* h = 2000 tan 28* tan 38* h ( tan 28* + tan 38* ) = 2000 tan 28* tan 38* h = 633 ( cor. to 3 s.f. )
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