A town Q is on a bearing of 210 degree from P;R is another town on a bearing of 150 degree from P east of Q.The distance between R and P is 10km.Find the distance between R and Q?
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if origin of x y axis system at P
Q is 210-180=30 degrees above -y axis
R is 90+60 degrees or 60 below +x
direction form Q
that means angle PQR is also 30 degrees
so QR=RP=10.
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