Solid Angle Equation Proof?

U

uoitcheater

New member
Show that the solid angle subtended by a disk shown to the right at the point P which is a distance z from the disk on a line perpendicular to the center of the disk is:

? = 2?(1-cos?)

Here is a picture that may help with the question:

http://farm6.static.flickr.com/5180/5429824969_12520008a4_z.jpg

Please and thank you for any tips or solutions to this question.

-Joe
 
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