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datos:
radio:?
longitud:?
__________
inciso A:
radio=diamentro/2
radio=4cm/2
radio=2cm
___________
area=pi* (radio)^2
area=3,1416*(2cm)^2
area=12,56cm^2
______________
longitud=2*pi*radio
longitud=2*3,1416*2cm
longitud=12.56cm
________________
inciso B
radio=2,5cm
___________
area=19.63cm^2
_____________
longitud=15.70cm
saludos