If you are talking about circumference & diameter, the answer is the circumference divided by pi. So 100 divided by pi=31.830988618379067153776752674503=d
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D = 500 and C = 100, so DCCC = 500 + 100 + 100 + 100, which equals 800.
The answer might depend on what c and d are supposed to be!
D = 500, C = 100, V = 5 and I = 1. DCVI equals 606.
c = 6 and d = 7
In Roman numerals C = 100 and D = 500. The combination CD literally means 100 before 500, which is 400. I equals 1 and III equals 3. So CDIII equals 403.