Find a sine

The point thar you are missing and that is undoubtedly in your text is how to measure the angle between two planes. How does your text define the angle between two planes?
 
I am translating into English but to be honest, even in my mother language I read that problem maybe for 3 times. The keywords are angle, sine of that angle, sidewall and base plane. All problems appear due to my misunderstanding of this problem's text...
 
marinaa11 said:
I am translating into English but to be honest, even in my mother language I read that problem maybe for 3 times. The keywords are angle, sine of that angle, sidewall and base plane. All problems appear due to my misunderstanding of this problem's text...
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Yes, we understand that English is not your native language, and it does not appear that anyone here knows the language in which your text is written. That makes things slow.

But you learned in plane geometry that angles are formed between intersecting lines. The key question is what line or lines are used to determine the angle between intersecting planes? Your text should give you such a definition in your native language. (I looked on google and had to search a while to find a definition in English not framed in vectors, which probably would do you no good.) So we are talking with mutual understanding, please try to translate the definition that you have been given on how to measure the angle between intersecting planes.
 
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