- A180°
- B90°
- C270°
- D360°
Step-by-Step Solution
Angle sum property: the three interior angles of a triangle sum to 180°; combining with the linear pair gives the exterior angle property.
Answer: A) 180°
The exterior angle property says the exterior angle equals the sum of interior opposite angles because the exterior and adjacent interior angle form 180° and all three interior angles also sum to:
Class 7Exterior Angle PropertyTriangles
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