Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 21)
In a triangle ABC, if a = 10cm, b = 16cm, and C = 150°, what is the area of the triangle?
40 cm²
80 cm²
120 cm²
100 cm²
คำอธิบาย
Area = 1/2 * 10 * 16 * sin(150) = 40 cm²