To create a part of a certain piece of machinery, four equal-size wedge-shaped pieces are cut and removed from a

To create a part of a certain piece of machinery, four equal-size wedge-shaped pieces are cut and removed from a circular piece of metal, as illustrated in the diagram above. If the unshaded portion of the circle represents the material remaining after the pieces are removed, what percentage of the original circle remains?

A. 10
B. 20
C. 25
D. 60
E. 80

The OA is E

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