Given: ABCD is a parallelogram. Prove: AB CD and BC - DA
Angles Segments Triangles Statements Reasons
def. of parallelogram
unique line postulate
def. of alt, interior angles
alternate interior angles theorem
B
С
Statements
1. ABCD is a parallelogram
2. AB || CD
Reasons
1. given
2. def. of parallelogram
A
D
Correct! Assemble the next
statement