posted by Anonymous .
A cyclist starts from point X and rides 3 km due west to point Y. At Y he changes direction and rides 5km north-west to point Z.
(a) hw far is he from the starting point, correct to the nearest km?
Find the bearing of the Z frm X to the nearest degree?
The angle XYZ = 135o
According to the Cosine Law
=sqr(9+25+30 (-0.707))= 7.43 km ≈7 km.