Two towns, P and Q, are on (4oN 40oW) and (4oN
20oE) respectively. What is the distance between
them, along their line of latitude? (Give your
answer in teems of π and R, the radius of the earth).
The correct answer is D. ÏR/3 cos4o
Angular distance = 40o + 20o = 60o
using θ/360 x 2Ïr for distance between p and Q
= 60/360 x 2ÏRcos4o = 1/3ÏRcos4o
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