What is the circumference of a circle with a diameter of 30 centimeters?
a)188.4 cm
b) 47.1 cm
c) 94.2 cm
d) 9.55 cm

• circumference of circle=2*pi*r
  given diameter d=30cm
  radius=d/2=15cm
  so circumference=2*pi*15=94.2
  which is option c)94.2
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