(4) If the angle be 30°, then accordingto ratio, Second angle = 60° Third angle = 180° – 60° – 30° = 90° If the given ratio be of two otherangles, then x+2x=180°–30°=150° ⇒3x=150°⇒x=50° ∴ Second angle =2×50=100° Hence, the largest angle= 90° or 100°