WAEC - Mathematics (1994 - No. 29)
Two ships on the equator are on longitudes 45oW and 45oE respectively. How far are they apart along the equator, correct to 2 significant figures? (Take the radius of earth = 6400km and π = 22/7)
15,000km
10,000km
6,400km
5,000km
3,200km
解释
D = θ/360 x 2πR
= 10057 ≅ 10000km
45 + 45360o
x 447
x 6400= 10057 ≅ 10000km