A is the only parallelogram that can be inscribed in a circle.
Check the final answer first, then review the worked steps.
Problem
A ___ is the only parallelogram that can be inscribed in a circle.
Step-by-step solution
A parallelogram can be inscribed in a circle if and only if it is a rectangle. This is because opposite angles of a cyclic quadrilateral must be supplementary, and in a parallelogram, opposite angles are equal. Thus, each angle must be 90 degrees.
Answer
rectangle