WAEC - Mathematics (1997 - No. 13)
Two points P and Q are on longitude 67°W. Their latitudes differ by 90°. Calculate their distance apart in terms of π. (Take radius of the earth = 6400km).
6400πkm
6400km/π
3200πkm
3200km
3200km/π
Paliwanag
P(67°W, 0°N)
Q(67°W 90°N), R = 6400km
Distance PQ =
90/360 x 2 x 6400 π
= 3200πkm