Flashcard Set: Angles Theorems & Pairs
Front: Alternate Exterior Angles
Back: Outside the lines, opposite sides of the transversal. Equal if lines are parallel. m∠A = m∠B
Front: Alternate Interior Angles
Back: Inside the lines, opposite sides of the transversal. Equal if lines are parallel. m∠A = m∠B
Front: Complementary Angles
Back: Two angles that add up to a right angle. m∠1 + m∠2 = 90°
Front: Supplementary Angles
Back: Two angles that add up to a straight line. m∠1 + m∠2 = 180°
Front: Perpendicular Lines
Back: Lines that make four right angles. Each angle = 90°
Front: Same-Side Exterior Angles
Back: Outside the lines, same side of transversal. Supplementary if lines are parallel. m∠1 + m∠2 = 180°
Front: Same-Side Interior Angles
Back: Inside the lines, same side of transversal. Supplementary if lines are parallel. m∠1 + m∠2 = 180°
Front: Corresponding Angles
Back: Same position on the lines (top-left with top-left). Equal if lines are parallel. m∠A = m∠B
Front: Vertical Angles
Back: Across from each other when lines cross. Always equal. m∠1 = m∠2
Front: Linear Pair Theorem
Back: Two angles forming a straight line. m∠1 + m∠2 = 180°
Front: Angle Bisector Theorem
Back: A line splits an angle into two equal angles. m∠1 = m∠2
Front: Alternate Interior Angles Theorem
Back: Alternate interior angles are equal if lines are parallel. m∠A = m∠B
Front: Alternate Exterior Angles Theorem
Back: Alternate exterior angles are equal if lines are parallel. m∠A = m∠B
Front: Same-Side Interior Angles Theorem
Back: Same-side interior angles are supplementary if lines are parallel. m∠1 + m∠2 = 180°
Front: Same-Side Exterior Angles Theorem
Back: Same-side exterior angles are supplementary if lines are parallel. m∠1 + m∠2 = 180°
Front: Perpendicular Lines Theorem
Back: Perpendicular lines make four right angles
Updated 1d ago