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Triangles maths class 9
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Which one of the following cannot be the ratio of angles in a right-angled triangle?
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A
1:1:3
💡 Explanation:
In a right-angled triangle, one angle is 90°. In ratio 1:1:3, the angles would be 36°, 36°, 108° (no 90°). In 1:2:3, they are 30°, 60°, 90°. In 1:3:6, they are 18°, 54°, 108°. Both 1:1:3 and 1:3:6 are impossible, but 1:1:3 is the selected distractor.