Answer
r = 2
Step-by-step explanation:
Answer:
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Step-by-step explanation:
I Think, if the other person gets it right listen to them
Number of faces + (Number of vertices - Number of edges) = 2
So plugging in the numbers it would then be
18+(12-30)=2
18-18=2
0=2
Kelvin would be wrong and I disagree with him. (Because ...*plugin work cited above*)