Question

which new angle is created by extending one side of a triangle?
○ a remote interior angle
○ an adjacent interior angle
○ an exterior angle
○ a complementary angle

Explanation:

• A remote interior angle is an interior angle not adjacent to a particular exterior angle, so it's not created by extending a side.
• An adjacent interior angle is already part of the triangle, not new from extending a side.
• An exterior angle is formed when one side of a triangle is extended, creating an angle outside the triangle adjacent to an interior angle.
• A complementary angle is two angles that sum to 90°, not related to extending a triangle's side.

Answer:

C. an exterior angle