Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 7 - No. 5)

What is the appropriate formula to use, to calculate the area of a triangle when the length of two sides and an included angle are given?

Area = 1/2 * base * height

Area = (a * b) / 2

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

Area = a + b + c

Using the sin formula is the best for this