Kelly and Daniel wrote the following proofs to prove that vertical angles are congruent. Who is correct?

Both Kelly and Daniel are correct.

Neither Kelly or Daniel is correct.

Kelly is correct, but Daniel is not.

Daniel is correct, but Kelly is not.

Question

Kelly and Daniel wrote the following proofs to prove that vertical angles are congruent.  Who is correct? 

Both Kelly and Daniel are correct.

 Neither Kelly or Daniel is correct.

 Kelly is correct, but Daniel is not.

 Daniel is correct, but Kelly is not.

anonymous · Answer

Daniel’s Proof 

Statement
Justification
1 + 2 = 180°
Definition of Supplementary Angles
1 + 4 = 180°
Definition of Supplementary Angles
1 + 2 = 1 + 4
Transitive Property of Equality
2 = 4
Subtraction Property of Equality

anonymous · Answer

User: Brooke Dalton 
In Course: Geometry V14 ( 3801)
Instructor: Ricardo Roque
09.03 Line Proofs

Warning: There is a checkbox at the bottom of the exam form that you MUST check prior to submitting this exam. Failure to do so may cause your work to be lost.

Question 1 (Multiple Choice Worth 4 points)


  
Kelly and Daniel wrote the following proofs to prove that vertical angles are congruent.  Who is correct? 

 

Kelly’s Proof 

Statement
Justification
2  = 4
Vertical angles are congruent
1  = 3
Vertical angles are congruent
Vertical Angles are congruent.
Vertical Angle Theorem

anonymous · Answer

attachment

anonymous · Answer

i am on that same problem...lol i need help too