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In triangle LMN, angle L : angle M : angle N = 1 : 1 : 4.
Is the triangle acute, right or obtuse, and what is the largest angle?

Class 7Angle Sum PropertyTriangles
  • AAcute; 90°
  • BRight; 90°
  • CObtuse; 120°
  • DObtuse; 100°

Step-by-Step Solution

, so . Largest = deg, which is more than 90°, so the triangle is obtuse.
Answer: C) Obtuse; 120°

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