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C= 2 \pi r
Diameter=100 cm
Radius= ½ of diameter
          = 50 cm
Pi  \pi =3.14
C=2 \pi r
C=2 x (3.14 x 50cm.)
C=2 x 157cm.
C=314 cm.
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The answer is 314 cm. 3.14*100 - you just have to move the decimal digits to the right; two zeroes = two movements.
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