Question

To determine the measures of all angles of a parallelogram, which of the following information is needed?

• 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.

In a parallelogram we know that:
1. The adjacent angles are supplementary.
2. The opposite angles are equal.

Thus, if the measure of one interior angle is known, we can find the measures of all angles of the parallelogram.