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What are the properties of a parallelogram?
Property 1:
Opposite sides of a parallelogram are congruent.
In the above parallelogram, AB = CD and AD = BC
Property 2:
Opposite angles of a parallelogram are congruent.
In the above parallelogram, ∠A = ∠C and ∠B = ∠D
Property 3:
The diagonals of a parallelogram bisect each other.
Here, AC bisects BD at the intersection point, O.
Property 4:
Consecutive angles are supplementary or add up to 180 degrees.
In the above parallelogram,
∠A + ∠B = 180°
∠B + ∠C = 180°
∠C + ∠D = 180°
∠D + ∠A = 180°
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