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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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