WAEC - Mathematics (2007 - No. 43)
The bearing of a point P from another point Q is 310o. If |PQ| = 200m, how far west of Q is P?
128.6m
153.2m
167.8m
187.9m
Wyjaśnienie
cos 40 = \(\frac{x}{200}\)
x - 200 x cosx
= 200 x 0.7660
x = 153.2m
x - 200 x cosx
= 200 x 0.7660
x = 153.2m