The circular ring has an inner radius of 2 and outer radius of 5.
A gnomon to the circular ring shown is
A. another circular ring with inner radius 5 and outer radius 12.5.
B. a circle of radius 5.
C. another circular ring with inner radius 2 and outer radius 5.
D. a circle of radius 2.
E. none of these
Answer: E
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A. - 
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D. 
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