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Surface area of Sphere

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The surface area of a sphere is:

A = 4¥ðr^2 = ¥ðd^2  

r : radius of sphere
d : diameter of sphere

*** Âü°í¹®Çå[References] ***

NCEES, FUNDAMENTALS OF ENGINEERING SUPPLIED-REFERENCE HANDBOOK, 4th edition
https://en.wikipedia.org/wiki/Surface_of_revolution#Area_formula
A = ¥ð*d^2
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