Steradian- measuring solid angles: from fizzics.org

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We measure angles on paper, in two dimensions, in either degrees or radians but when we need to deal with three dimensions, for example when something spreads out like a cone, then the unit used is a steradian. The video illustrates and explains exactly what a steradian is.
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Thank you so much for the explanation, sir. Educators like you are massively underrated.

themaverick
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Short, easy and smart way to understand the students. Just Wow 😮❤

DailyLife
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I am barely in college calc 1. I saw steradians in an article i read and im wondering what is a SOLID angle? And what does subtended mean? Thank you.

michaeldouglas
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I'm sryy for asking really basic/naive question
But Please may I know, how did you get the area = R2 (r square)🙏

Physics-conf