Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 6 - No. 25)
What is the formula for finding the area of a triangle when given the lengths of two sides (a and b) and the included angle (C)?
Area = 1/2 * a * b * sin C
Area = a * b * cos C
Area = a * b / 2
Area = 1/2 * (a + b) * sin C
Explicació
The formula requires the sine of the included angle.