The angles of a triangle are in the ratio 1 : 1 : 2. What percentage of the total internal angle is the greatest angle?

50% 65% 45% 40%

50%

Ratio of angles = 1 : 1 : 2 = 4R Total internal angle = 180° = 4R                                       1R = 45° ∴ Greatest angle = 90° Thus, the greatest angle is 50% of the total internal angle