(Be careful. This post is utterly 
, faking by misguiding diagram.)
Provided that 
which could be partly true (e.g. its value approximating not so exact) and assumed are those angles (in degrees) precisely correct, find 
.
as seen.
物理子衿
物理子衿
(Be careful. This post is utterly , faking by misguiding diagram.)
Provided that which could be partly true (e.g. its value approximating not so exact) and assumed are those angles (in degrees) precisely correct, find .
as seen.