Respuesta :

the area of a sphere is: A=4 π R^2

where R= radius

So R= diameter/2

R= 21 cm

[tex]\begin{gathered} A=4\pi\cdot(21)^2 \\ A=4\cdot3,14\cdot441 \\ A=5541,8 \end{gathered}[/tex]

So the answer is: 5541.8 cm2

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