All angles add up to 360°.
Angles A and C are equal.
Angles B and D are equal.
Angles A and B are equal to 180°.
Angles C and D are equal to 180°.
Angles B and C are equal to 180°.
Angles A and D are equal to 180°.
Sides AB and CD are equal.
Sides BC and AD are equal.
Sides AB and CD are parallel.
Sides BC and AD are parallel.
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