Question

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

Explanation:

Vertical angles are formed when two lines intersect. They are always congruent. In the diagram, angle 1 and angle C are vertical angles as they are opposite each other at the intersection of two lines. Interior angles of a triangle are the angles inside the triangle, which is not the case here. Exterior - angles are outside the triangle related to its sides. Corresponding angles are related to parallel - lines and a transversal, which is not applicable here.

Answer:

They are vertical angles.