Mathematics for IGCSE & O level - Angles (Section 2 - No. 49)
In a triangle, the angles are in the ratio 1:2:3. What is the measure of the largest angle?
30°
60°
90°
120°
설명
Angles are x, 2x, 3x. x + 2x + 3x = 180, so 6x = 180 and x = 30. The largest angle is 3x = 90°.