JAMB - Mathematics (1995 - No. 25)
Find the distance between two towns P(45°N, 30°W) and Q(15°S, 30°W) if the radius of the earth is 7000km. [\(\pi = \frac{22}{7}\)]
\(\frac{1100}{3}\)km
\(\frac{2200}{3}\)km
\(\frac{22000}{3}\)km
\(\frac{1100}{3}\)km
Explicació
Angular difference = 45° + 15° = 60°.
\(D = \frac{60°}{360°} \times 2 \times \frac{22}{7} \times 7000\)
= \(\frac{22000}{3} km\)