why is the surface area of a sphere multiplied by 4（関連順）

15:51

But why is a sphere's surface area four times its shadow?

3Blue1Brown

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なぜ球の表面積は半径の2乗に4πを掛けたものになるのでしょうか？

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Proving that the Volume of a Sphere is 4/3 * πr^3 #maths #calculus

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Video 4: Surface Area of Sphere

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Activity on Surface Area of Sphere

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結果 : why is the surface area of a sphere multiplied by 4