Question 1172084
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Make a sketch and notice that you have the triangle in the sketch with two given sides  (the radii)

and the given angle between them.


Hence,  you can apply the  Cosine law to find the third side length.


Also notice from the sketch that the third side is the distance between the centers.


Hence,  by doing this way,  you will get the answer, sooner or later.
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Happy calculations (!)


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On the Cosine law, &nbsp;see the lessons


&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF= http://www.algebra.com/algebra/homework/Trigonometry-basics/Proof-of-the-Law-of-Cosines-revisited.lesson> Proof_of_the_Law_of_Cosines_Revisited</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF = http://www.algebra.com/algebra/homework/Trigonometry-basics/Solve-triangles-using-Law-of-Cosines.lesson> Solve triangles using Law of Cosines</A>


in this site.


In addition to the theory, &nbsp;clearly explained, &nbsp;you will find there many solved problems, &nbsp;that are your &nbsp;TEMPLATES.



Consider these lessons as your handbook, &nbsp;textbook, &nbsp;guidelines, &nbsp;tutorials and &nbsp;(free of charge) &nbsp;home teacher.