Mathematics for IGCSE & O level - Angles (Section 3 - No. 27)
In a triangle, the angles are represented by x, 2x, and 3x. What is the value of x?
30°
45°
60°
90°
Giải thích
The sum of angles in a triangle is 180°. x + 2x + 3x = 180; 6x = 180; x = 30°.