whats the angle of <VXW

Question

What is the angle of <VXW

Answer 1

Following a standard notation, if the 3 triangle vertex points W, X, V are opposite triangle legs of lengths w, x, v respectively, then the angle ∠VXW is opposite the leg of length x and by the Al-Kashi Theorem has measure 0 ≤ arccos((w² + v² – x²)/(2wv)) ≤ π.