The number rule for this sequence is that each time the number goes up,
it does so by whatever the previous amount added was, multiplied by two.
So far we can see the sequence is +50, +25-, +500, +1000, so we assume
that next it will be +2000 and the next number in the sequence will
therefore be 22,000 <span />
The formula for circumference is 2*pi*radius(you can use circumference = diameter*pi too). Plug 285.74 into it. Divide both sides by 3.14, and you get 2*radius(aka the diameter) = 91
