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From Karnataka Open Educational Resources
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An exterior angle of the triangle is the angle between one side of a triangle and the extension of an adjacent side. Exterior angle of the triangle has a relation with interiors of the triangle.
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=== Objectives ===
 
=== Objectives ===
 
To show interior angles of a triangle have a relation with its exterior angles.
 
To show interior angles of a triangle have a relation with its exterior angles.