Answer: True, If a circle is circumscribed about a parallelogram, the parallelogram must be a rectangle.
Explanation:
It is true statement.
Since we know that if a circle is circumscribed about a parallelogram, the parallelogram must be a rectangle.
As circumscribed parallelogram has the sum of opposite sides of the parallelogram is supplementary.
So, each angle becomes right angle and we know the property of parallelogram that opposite sides are equal.