Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 11)
If a boat sails 10 km on a bearing of 030° and then 15 km on a bearing of 120°, which formula can be used to find the direct distance from the starting point?
Pythagorean Theorem
Sine Rule
Cosine Rule
tan θ
ব্যাখ্যা
The Cosine Rule is used to find the third side of a triangle when two sides and the angle in between are given.