Question 1181692
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Use the Law of Cosines for the first one, and the Law of Sines for the second one.  Since there is no "2" anywhere on the second drawing, all I can say is that the value of 2 is painfully obvious: 2.

																
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
*[illustration darwinfish.jpg]

From <https://www.algebra.com/cgi-bin/upload-illustration.mpl> 
I > Ø
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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