They both are areas. Just Kidding. Both of them have to have a height and length.
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No, a circle can't be a parallelogram. A circle is a curve. A parallelogram is a quadrilateral with two pairs of parallel sides constructed with four line segments. The line segments are straight, and the circle is a continuous curve.
You can use the formula for the area of a circle to compare (i.e., divide) the areas.
rectangle
The circle - the rest are polygons.
Not normally because it is a circle that has radius.