540 degrees 540o
They add up to 3960 degrees
360
five sides...
180
540 degrees 540o
The 7 interior angles add up to 900 degrees
They add up to 3960 degrees
1080 ish.
360
five sides...
180
360
720
540
The exterior angles of a 15 sided shape add up to 360 degrees
The 8 interior angles of an 8 sided octagon add up to 1080 degrees