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October 12th, 2014, 02:48 AM   #1
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Finding approximate area of square traced by beam of light

I want to find area of a square which is traced by the beam of a
light. Let's say angle between the beam of light is \theta. Now the
beam will be in shape of triangle on the square.

We can easily find the area of the area covered by beam from the
square by finding out the intersection points. But that is very
costly. I want some approximate method to find the area to make it
less computationally expensive.
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October 15th, 2014, 03:51 PM   #2
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That's hard to understand.
How many parameters will determine an exact answer?
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