Question

question 16 of 25 to make sure that a given parallelogram is a rectangle, at least how many of its angles must measure 90°? a. one b. two c. four d. three

Explanation:

Step1: Recall parallelogram properties

In a parallelogram, opposite angles are equal and adjacent angles are supplementary (sum to 180°).

Step2: Analyze angle - 90° case

If one angle of a parallelogram is 90°, then its adjacent angle is 180° - 90°=90° due to supplementary angles. And since opposite angles are equal, all four angles will be 90°. So, if at least one angle of a parallelogram is 90°, it is a rectangle.

Answer:

A. One