To answer this question we will use the following formula to compute the surface area of a sphere:
[tex]SA=\pi diameter^2.[/tex]
Therefore the surface area of a sphere with a diameter of 20cm is:
[tex]SA=\pi(20cm)^2.[/tex]
Simplifying the above result we get:
[tex]SA=400\pi cm^2.[/tex]
Answer:
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