Respostas

2014-06-12T00:37:47-03:00
A=π.r(2)
A=3,14.2,5(2)
A=3,14.6,25
A=19,625 cm
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2014-06-12T01:32:42-03:00
C=2.π.r²

C= 2.3,14.( 2,5)²

C=6,28.6,25

C=39,25 cm²