Code of program:
import math
print("calculate ring area")
R=input("R=")
R=float(R)
r=input("r=")
r=float(r)
area=math.pi*((R**2)-(r**2))
print("area=")
print(area)
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There is a draft or 2D sketch: And there are two views of a 3D model: 3D model have been created by author of article.
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