If 45° and 65° are two angles of a triangle, find the exterior angle corresponding to the third angle (i.e., the exterior angle at the vertex of the third angle).

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Step 1: The sum of the angles in a triangle is 180°.
Let the third angle be x.
So, 45° + 65° + x = 180°
=> x = 180° - 45° - 65°
=> x = 180° - 110°
=> x = 70°

Step 2: The exterior angle at the vertex of the third angle is equal to the sum of the other two interior angles (by the exterior angle property of triangles).
So, exterior angle = 45° + 65° = 110°

Therefore, the correct answer is 110°.

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