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Discussion

A triangle can have:

  • A.Two right angles
  • B.Two obtuse angles
  • C.Two acute angles
  • D.All of the above

Answer: C

The sum of angles in a triangle is 180°.

Two right angles (90°+90°=180°) would leave 0° for the third angle, which is not possible.

Two obtuse angles (each >90°) would make the sum exceed 180°, which is not possible.

A triangle can always have two acute angles (e.g., in a right-angled triangle or an obtuse-angled triangle). In fact, every triangle must have at least two acute angles.

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