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Kabir claims a triangle can have one angle of 0° if the other two add to 180°.
Why is Kabir wrong?

Class 9Angle Sum of a TriangleGeometry — Lines and Angles
  • AA 0° angle means the sides overlap, so no triangle forms
  • BBecause 180° is too small
  • CBecause all angles must be 60°
  • DHe is actually right

Step-by-Step Solution

An angle of 0° means two sides lie on top of each other, the three points become collinear and no genuine triangle is formed.
Answer: A) A 0° angle means the sides overlap, so no triangle forms

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