Answer:
13
Step-by-step explanation:
sum of interior angles in a polygon with n sides is given by,
[tex](n - 2) \times 180[/tex]
therefore ;
[tex]22 \times 90 = (n - 2) \times 180[/tex]
[tex]n - 2 = 11[/tex]
[tex]n = 13[/tex]
