Usman458
Usman458 Usman458
  • 11-08-2016
  • Mathematics
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emowolf101
emowolf101 emowolf101
  • 11-08-2016
If the perimeter of a circle is d*pi, then you would do ((30*3.14)-(20*3.14))/2 to find the perimeter. 30*3.14=94.2 20*3.14=62.8 94.2-62.8=31.4 31.4/2=15.7 cm
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