alternate interior angles
Either pair of interior angles lying on opposite sides of the transversal, which are formed when a transversal cuts two lines, such as symbol angle3 and symbol angle6 or symbol angle4 and symbol angle5.

When a transversal cuts two parallel lines, symbol angle3 = symbol angle6 and symbol angle4 = symbol angle5. In addition, symbol angle3 + symbol angle5 = 180° and symbol angle4 + symbol angle6 = 180°.

Related Terms: angle, transversal

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