Final answer:
The height of the parallelogram is equal to the radius of the circle, and the base is equal to twice the radius. The area of the circle is equal to the area of the parallelogram, and the circumference of the circle is equal to twice the perimeter of the parallelogram base.
Step-by-step explanation:
The height of the parallelogram is equal to the radius of the circle. The base of the parallelogram is equal to twice the radius of the circle. Therefore, the area of the circle (πr²) is equal to the area of the parallelogram, and the circumference of the circle is equal to twice the perimeter of the parallelogram base.