Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 19)
If two sides of a triangle are 5 cm and 12 cm, and the angle between them is 30 degrees, what is the area of the triangle?
30 cm²
60 cm²
15 cm²
none
説明
Area = 1/2 * 5 * 12 * sin(30) = 15 cm²