Samuel was given the diagram below and asked to prove that AC ED. What
would be the reasoning for the third step of the proof?
Given: Quadrilateral ABCD is a rectangle.
Prove: AC & BD
Statements
1. Quadrilateral ABCD is a rectangle
2. AB & CD
3. ZBAD ZCDA
4. AD AD
5. ABAD ACDA
6. AC BD
B
A
Reasons
Given
Opposite sides of a rectangle are equal
Reflexive Property of Equality
SAS Triangle Congruence Theorem
Corresponding parts of congruent
triangles are congruent
C
O