Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 21)
Given a triangle with sides 3cm, 4cm, and an included angle of 30 degrees, what is the area?
6cm^2
3cm^2
12cm^2
1cm^2
解释
The area is 1/2 * 3 * 4 * sin(30) = 3cm^2