It is given that , each angle of a regular polygon measures 160 . And to check the polygon, we have to use the following formula
![S= ((n-2)180)/(n)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/qkshxyq1lt4rof1bar1b2zw3cr561stjnl.png)
n is the number of sides
![160=((n-2)180)/(n)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ogmu5hpiyto4i30u2bm37vy8uss3twl4r6.png)
Cross multiplication
160n = 180n -360
Subtracting 180n to both sides
-20n =-360
Dividing both sides by -20
n =18
So the polygon must have 18 sides