Given the radius, r, of a circle, find the diameter; or given the diameter, d, of a circle, find the radius.r = 23
cm
A. d = 46
cm
B. d = 11.5
cm
C. d = 46
cm
D. d = 11.5
cm
Answer: A
Mathematics
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B. 
C. no real solution
D. 
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i
B. - 
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+ 
i
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