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Parallelograms
1
2
3
4
5
1
2
3
4
5
A
B
C
D
E
. . . .
A
B
C
D
E
Properties of Parallelograms (1)
Theorem.
Opposite angles of a parallelogram are congruent.
Given
:
Parallelogram
ABCD
Prove
:
∠
A
B
C
≅
∠
C
D
A
and
∠
D
C
B
≅
∠
D
A
B
Proof
:
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