Regular n-gon

In a regular n-angle polygon the internal angle is 144 degrees. Find the number n indicating the number of sides of this polygon.

Correct result:

n =  10

Solution:

$A=144 \ \\ A=(n-2) \cdot \ 180/n \ \\ An=180n - 360 \ \\ n=360/(180-A)=360/(180-144)=10$

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