For any polygon, do (sides-2)x180 degrees
For an octagon, do (8-2)x180=6x180=960(degrees)
The interior angles of a 9 sided nonagon add up to 1260 degrees and its exterior angles add up to 360 degrees
The exterior angle of a 7 sided shape add up to 360 degrees The interior angles of a 7 sided shape add up to 900 degrees
The 7 interior angles add up to 900 degrees
Interior angles = 1080 degrees Exterior angles = 360 degrees
Exterior angles add up to 360 degrees Interior angles add up to 2520 degrees
The exterior angles of a 15 sided shape add up to 360 degrees
The interior angles of a 9 sided nonagon add up to 1260 degrees and its exterior angles add up to 360 degrees
The interior angles of a 24 sided shape add up to 3960 degrees
Exterior angles add up to 360 degrees Interior angles add up to 900 degrees
180
360
720
360
540
The 8 interior angles of an 8 sided octagon add up to 1080 degrees
The total sum of angles of an n-sided shape is (n-2)x180o Hence, the angles in a five sided shape add up to (5-2)x180o = 3 x 180o = 540o
Exterior angles add up to 360 degrees Interior angles add up to 1080 degrees