[Papervision3D] trig help?

[Cadete B7]

i was wondering if anyone could lend me a little trig help...  given  
the radius and theta, what would the two lengths indicated by question  
marks be?  exsecant?  thanks.

link to diagram...
http://wilbcorp.com/links/trig.jpg

ps - sorry if this posts twice, i accidentally got bounced the first  
go-round with an attachment.

- Wilbur

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