Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 7 - No. 8)

Which rule allows you to find the area of a triangle if you know two sides and the included angle?

Heron's Formula

1/2 * base * height

Area = 1/2 * ab * sin C

Pythagorean theorem

The area of a triangle can be calculated using the formula 1/2 * ab * sin C where a and b are the sides and C the included angle.