Proving Perpendicular Lines

• No

• Yes, corresponding angles are congruent

• Yes, consecutive interior angles are congruent

• Yes, Alternate exterior angles are congruent

• 6
• 18
• 9
• 75

• 90
• 60
• 45
• 30

g⊥e and g⊥f, determine if there is enough information to show lines ∠6≅∠10

• yes, both 90^o

• not enough information

If AC ⟂ BD, then ∠DBC is a right angle.

• Definition of Perpendicular Lines

• Definition of Right Angle

• Angle Addition Postulate

• Segment Addition Postulate

What is the reason?

• Definition of perpendicular

• Definition of angle

If DA is perpendicular to IE, then we can immediately conclude that

• IA=AE

• <IAD and <DAE are right angles

• <IDA=<EDA

• Definition of Right Angle

• Complement Theorem

• Definition of Perpendicular Lines

• Definition of Complementary Angles

g⊥e and g⊥f, determine if there is enough information to show lines ∠7≅∠10

• yes, both 90^o

• not enough information

g⊥e and g⊥f, determine if there is enough information to show lines ∠7≅∠11

• yes, both 90^o

• not enough information