Understanding the concept of Solid Angle

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Why solid angle is given by the formula 𝑑𝛺=𝑑𝑆/𝑅^2 ?

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Solid Angle Derivation & Intuition

15:51
But why is a sphere's surface area four times its shadow?

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Steradian | Solid angle | solid angle example | solid angle 3d animation | solid angle animation

17:33
Understanding Thermal Radiation

27:26
This open problem taught me what topology is

17:29
Elon Musk exposes why Democrats don’t want ‘waste and fraud’ to be turned off

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