Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 2 - No. 23)
In the ambiguous case of the sine rule, when does an obtuse angle solution become impossible?
When the given side is shorter than the opposite side.
When the given angle is obtuse.
When the calculated angle is greater than 180°.
When the given angle is acute and the opposite side is shorter than one of the adjacent sides.
Spiegazione
If a given angle is acute and opposite side is shorter, there may be ambiguous case.