At around 20'000ft. and higher.
Answer:
I think the answer is 1 I really hope this helps
Step-by-step explanation:
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*)
Not enough information
Explanation: in order for them to be congruent it must have at least two equal sides or 2 equal angles
