Vertical and Adjacent angles, Parallel lines and Angle relations

How do the properties of vertical and adjacent angles help in determining unknown angles in geometric figures?

• The properties of vertical angles being equal and adjacent angles being supplementary help in determining unknown angles in geometric figures.
• Vertical angles are always complementary.

What is the relationship between parallel lines and the angles formed when they are intersected by a transversal?

• All angles formed are equal to 90 degrees.
• The angles formed have no specific relationships.
• All angles formed are complementary.
• The angles formed have specific relationships: corresponding angles are equal, alternate interior angles are equal, and consecutive interior angles are supplementary.