Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 2 - No. 35)
Which rule is primarily used to find missing side lengths and angles in a non-right-angled triangle when the lengths of all three sides are known?
Sine Rule
Cosine Rule
Pythagorean Theorem
Tangent Rule
Vysvětlení
The Cosine Rule works when SSS is known.