Proving the Parallelogram Side Theorem Try it
Given: ABCD is a parallelogram.
Prove: ABCD and BC DA
Angles Segments Triangles Statements Reasons
AB
AC
BC
CD
DA
B
С
Statements
✓ 1. ABCD is a parallelogram
✓ 2. draw AC
3. AB || CD
Reasons
1. given
2. unique line postulate
3. def. of parallelogram
D
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