Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 33)
In the formula a^2 = b^2 + c^2 - 2bc*cosA, which side is opposite to angle A?
Side b
Side c
Side a
Side a and b
คำอธิบาย
The side 'a' is always opposite angle A.