- A45°
- B225°
- C135°
- D55°
Step-by-Step Solution
An exterior angle and its adjacent interior angle form a linear pair: 180° − 135° = 45°.
Answer: A) 45°
An exterior angle of a triangle measures 135°. What is the interior angle adjacent to it?
Class 9Exterior Angle of a TriangleGeometry — Lines and Angles
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