Question

I need help with this prove. I can't use the LAL criteria.

Answer 1

I'm not sure about the angle and what to do next.

Answer 2

You want to prove triangle BAD is congruent to triangle CDA. Then you can get the diagonals of the square congruent by corresponding sides of congruent triangles.

Answer 3

1. AB = CB Def of Square (as you put)
2. <BAD is congruent to < CDA --- Def of Square
3. segment AD is congruent to segment AD -- Reflexive Property
4. Triangle BAD is congruent to Triangle CDA -- SAS Postulate (LAL)
5. Segment BD is congruent to Segment AC -- Corresponding sides of congruent triangles are congruent

Answer 4

i got same thing

Answer 5

if u want my answer give me a medal first!