Ring the Try it
arallelogram Side Theorem
Given: ABCD is a parallelogram.
Prove: AB CD and BC DA
Angles Segments Triangles Statements Reasons
reflexive property
unique line postulate
def. of alt. interior angles
alternate interior angles theorem
B
Statements
1. ABCD is a parallelogram
2. AB || CD
3. BC || DA
Reasons
1. given
2. def. of parallelogram
3. def. of parallelogram
A
D
Add a segment to the diagram