-30 would be an appropriate integer to pick in this case; 0 here would represent sea level, while the negative sign represents the fact they we’re below it instead of above it.
The exterior and an interior angles always add up to 180 degrees. 180-150=One exterior angle 180-150=30 We know that all of the exterior angles add up to 360 360/30= the number of sides 360/30=12 The shape has 12 sides.
