Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 7 - No. 12)
If you have a triangle with sides 8 cm, 10 cm, and an included angle of 45 degrees, what is the area?
28.3 cm²
56.6 cm²
40 cm²
20√2 cm²
คำอธิบาย
Area = 1/2 * 8 * 10 * sin(45) ≈ 28.3