Lines & Transversal

Key Vocabulary and Concepts

Basic Terms

• Congruent: Equal Measures

• Supplementary: Add to 180°

• Adjacent: Share a side

• Transversal: (See picture for illustration)

• Complementary: Add to 90°

Symbols

• Vocabulary Symbols: ≅

Angles and Their Relationships

Vertical Angles

• Vertical Angles: The angles opposite each other when two lines cross.

Linear Pair

• Linear Pair: Add Up to 180°

• Definition: A pair of adjacent angles that form a straight line.

Consecutive Interior Angles

• Consecutive Interior: Add Up to 180°

• Definition: Angles that are on the same side of the transversal and inside the two lines.

Consecutive Exterior Angles

• Consecutive Exterior: Add Up to 180°

• Definition: Angles that are on the same side of the transversal and outside the two lines.

Alternate Interior Angles

• Alternate Interior: Add Up to 180°

• Definition: Non-adjacent interior angles that lie on opposite sides of the transversal.

Alternate Exterior Angles

• Alternate Exterior: Add Up to 180°

• Definition: Non-adjacent exterior angles that lie on opposite sides of the transversal.

Corresponding Angles

• Corresponding Angles: Angles that are in the same position at each intersection where a straight line crosses two others.