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Question
To determine all angles of a parallelogram, which of the following is the minimum necessary condition?
Options:
A .  Only one angle is known.
B .  Two angles are known.
C .  Three angles are known.
D .  Length of sides should be known
Answer: Option A
:
A
If one angle of a parallelogram is known, the other angles can be found out by applying the following two properties:
1. The adjacent angles are supplementary.
2. The opposite angles are equal.

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