??? du yu meen ALL other sides=120deg?
sum av all sides in polygon=180*(n-2) weer n=number sides
=number angels
yu spesifi 2 sides=90deg, so theer sum=180 deg
sum av all angels=180+120*(n-2) but it gotta =180*(n-2)
180-240-120n=180n-360
or 180-240+360=(180+120)n
300=300n
so n=1
Polygon kant hav 1 side