the surface area of a sphere is 5544cm square find its diameter
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Surface area of sphere= 4πr²=5544cm²
⇒πr²=5544÷4
⇒πr²=1386
⇒22/7r²=1386
⇒r²=63×7
⇒r=3×7
⇒radius=21cm
⇒diameter=2*radius=2*21
=42cm
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