Respuesta :

apologiabiology
SA=4pir^2
r=20m
SA=4pi20^2
SA=4pi400
SA=1600pi m^2
the formula of surface area of sphere= 4pi*r^2
radius=20 m
S.A=4*pi*20^2
S.A=4*pi*400
S.A=1600 pi m2
so the answer is a 1600 pi m2

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