Explore the Alternate Interior Angles Theorem with our interactive calculator. Input two alternate interior angle measurements to instantly determine if the lines intersected by a transversal are parallel. Understand this fundamental geometry concept and verify angle equality for proofs and problem-solving.
Formula:
The Alternate Interior Angles Theorem states that if two parallel lines are cut by a transversal, then the alternate interior angles are equal. Conversely, if the alternate interior angles formed by two lines and a transversal are equal, then the lines are parallel. This calculator helps you verify this principle:
If ∠A and ∠B are alternate interior angles, then:
If ∠A = ∠B, the lines are parallel.
If ∠A ≠ ∠B, the lines are not parallel.