Question 1015374
<pre>
Yes, there is a formula:

{{{matrix(1,14,

The,sum,of,all,interior,angles,of,any,polygon,with,n,sides,""="",(n-2)*"180°")}}}

{{{matrix(1,3,1980,""="",(n-2)*"180°")}}}

You finish.  Solve that for n

Edwin</pre>