Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 7 - No. 47)
In a triangle, if all three sides are known, which rule can be applied to find the angles?
Pythagorean Theorem
Sine Rule
Cosine Rule
Angle Sum Property
คำอธิบาย
When all sides are known, you use the Cosine Rule to find the angles.