Well, since 9.8/2.1 = 4.6666666..., it is unlikely that a rational explanation will be provided. Of course, if you aren't sharing the entire problem statement, you could perhaps elicit a better response by the additional disclosure.
i didnt want to waste time in latex lol, dont know how good your geometry skills are either:
1/2 ( log(72) = to the step i posted orginally, this probably wont make much more sense.
but the example question these workings are from is to find the hyperbolic distance between the points:
P= 3+3i and Q= -4 +4i (which will give an h-line |z+1|=5 ..to save time)