Answer:
d = 1
Step-by-step explanation:

So I would think d = 1
Because pi = 3.14
so...
1(3.14) = C
I'm not 100% but that's what I would say.
Hope this helps!!
The greatest conman factor of 66 and 88 is 22
I'm not sure if this is correct,
but, I got:
130cm x 100cm ?
13,000cm ?