# physics

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• physics -

A steradian is a measure of solid angle.
Imagine that you are at the center of a hollow sphere of radius R. Now consider an area A of that sphere. Divide that area by R^2 and you have the solid angle subtended by A, in steradians.

A full sphere subtends a solid angle of 4 pi steradians, from a point inside

• physics -

A steradian is a measure of solid angle.
Imagine that you are at the center of a hollow sphere of radius R. Now consider an area A of that sphere. Divide that area by R^2 and you have the solid angle subtended by A, in steradians.

A full sphere subtends a solid angle of 4 pi steradians, from a point inside

• physics -

Do I detect an echo?

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Could someone help me to say this better?