Question

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

Explanation:

When a side of a triangle is extended, the new angle formed outside the triangle is called an exterior angle. A complementary angle is related to angle sum of 90°, adjacent interior is already inside, remote interior is non - adjacent interior, and adjacent interior is inside. So the correct one is an exterior angle.

Answer:

an exterior angle