Answer :

konrad509
[tex]\frac{(n-2)\cdot180}{n}=144\\ 180n-360=144n\\ 36n=360\\ n=10[/tex]

It's decagon.
www123gul
here is the formula for find the one inside of the polygon: 
(n-2).180/n (n shows how many sides does polygon have)
 so now we can solve the equation==== (n-2).180/n=144
1144n=(n-2).180
144n=180n-360
360=36n
n=10 
so we call it decagon :) 

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