Respuesta :
c=2pir=pid
given
c=28pi
28pi=2pir=pid
divide everybody by pi
28=2r=d
28=d
28=2r
divide 2
14=r
d=28 m
first option
r=14 m
given
c=28pi
28pi=2pir=pid
divide everybody by pi
28=2r=d
28=d
28=2r
divide 2
14=r
d=28 m
first option
r=14 m