Question

1. why is angle 1 congruent with angle c in the diagram? they are exterior angles to the triangle. they are vertical angles. they are corresponding angles. they interior angles to the triangle.

Explanation:

Vertical angles are formed when two lines intersect. They are opposite each other and are always congruent. Angle 1 and angle C are formed by the intersection of two lines and are opposite each other.

Answer:

They are vertical angles.