If "part" means "sub-multiple", then any rational number |x| < 8 will do.

The answer depends on the number of people in the household. For example, the poverty line for an individual is $10,890, so 125% for her would be $13,612.50. For a family of four, the corresponding numbers are $22,350 and $27,937.50. Threshold eligibility for a variety of programs is based on a percentage multiple of the federal poverty line; two common percentages are 125% and 185%. If you want more details about how the thresholds are used, here's a good link: http://aspe.hhs.gov/poverty/faq.shtml

Assuming the circumference to be 16... C=16=pi(d) d=16/pi; r=8/pi A=pi*r^2=64/pi ... approximately 20.38 sqft