Melissa writes the following proof for the theorem, If the diagonals of a quadrilateral bisect each other, the quadrilateral is a parallelogram.

Melissa's proof

1. For triangles AOB and COD, angle 1 is equal to angle 2 as they are vertical angles.
2. AO = OC and BO = OD because it is given that diagonals bisect each other.
3. The triangles AOB and COD are congruent by SSS postulate.
4. Similarly, triangles AOD and COB are congruent.
5. By CPCTC, AB is equal to DC.
6. By CPCTC, AD is equal to BC.
7. As the opposite sides are congruent the quadrilateral ABCD is a parallelogram.

Question

Melissa writes the following proof for the theorem, If the diagonals of a quadrilateral bisect each other, the quadrilateral is a parallelogram.

Melissa's proof

1. For triangles AOB and COD, angle 1 is equal to angle 2 as they are vertical angles. 
2. AO = OC and BO = OD because it is given that diagonals bisect each other. 
3. The triangles AOB and COD are congruent by SSS postulate. 
4. Similarly, triangles AOD and COB are congruent. 
5. By CPCTC, AB is equal to DC. 
6. By CPCTC, AD is equal to BC. 
7. As the opposite sides are congruent the quadrilateral ABCD is a parallelogram.

anonymous · Answer

Which is the first incorrect statement in Melissa's proof?

 Statement 5

 Statement 3

 Statement 4

 Statement 6

anonymous · Answer

help me

anonymous · Answer

The answer is statement 3 because I got it right on  my flvs test