Question

To determine all angles of a parallelogram, which of the following is the minimum necessary condition?

• A. Only one angle is known.
• B. Two angles are known.
• C. Three angles are known.
• D. Length of sides should be known

Answer 1

The correct option is A

Only one angle is known.

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.