Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 6 - No. 48)
What information is required to determine the angles of a triangle using the Cosine Rule?
Two sides and any included angle.
All three sides.
Two angles and a side.
Base and height of a triangle.
Giải thích
The three sides must be known to calculate angles using Cosine Rule.