Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 5 - No. 16)

How is the area of a triangle best computed when two sides (a and b) and the angle (C) between them are given?

Area = 1/2 * (a + b) * sin(C)

Area = √(s(s-a)(s-b)(s-c))

Area = 1/2 * a * b * sin(C)

Area = a * b * sin(C)

This formula is the correct one for this.