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).
- 2πR cos4o
- πR sin40o
- πR/2 cos4o
-
πR/3 cos4o
- πR/6 cos4o
The correct answer is: D
Explanation
Angular distance = 40o + 20o = 60ousing θ/360 x 2πr for distance between p and Q
= 60/360 x 2πRcos4o = 1/3πRcos4o