1a.
The total of the exterior angles of a polygon is always 360 degrees.
So if each one is 40, that's 360/40 = 9 sides
Answer: 9 sides
1b.
178 degree interior angle means a two degree exterior angle so 360/2 = 180 sides.
Answer: 180 sides
2.
A decagon is a 10 gon, so external angles 360/10 = 36 degrees and internal angles that are the supplement, 144 degrees.
