# Intersecting Line Properties

Lines a and b are intersecting lines.
Congruent Angle Theorems:
Vertical Angles
Supplemental Angle Theorems:
Linear Pair Theorems (form straight line):
Adjacent Angles at Point E
Move one slider at a time, make observations Congruent Angles should be equal in size. The Supplemental Angles/Linear Pairs should add to be 180°.

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