Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 37)
What type of trigonometry is combined with Pythagoras' theorem in the cosine rule?
Non-right-angled trigonometry
Right-angled trigonometry
Spherical trigonometry
Complex trigonometry
Explication
The cosine rule combines right-angled trigonometry with Pythagoras' theorem.