(2)一條三維空間的題目-有圖

圖片參考：http://i34.photobucket.com/albums/d117/toto01/10.jpg

I type English because I'm so tired
let AP=AQ
tan 60=VR/QR
QR=VR/√3
tan 30=VR/ER
ER=√3VR
∠ERQ=90
QR^2+ER^2=QE^2
(1/3)VR^2+3VR^2=QE^2
QE=√(10/3)VR
AQ=AE=√(5/6)VR
tan∠RQA=ER/QR=3
∠RQP=71.565
∠RPQ=18.435
AR^2=QR^2+AQ^2-2(QR)(AQ)cos(∠RQP)
AR^2=(1/3)VR^2+(5/6)VR^2-2√(5/18)VR^2cos(71.565)
AR=0.91287VR
tan∠VAR=VR/AR=1.0954
∠VAR=47.61
從A 點對竹桿頂V 所測得的仰角是47.61