1260 degrees.
Use this formulae to work out any shape.
(n-2) x 180= answers
n=Number if sides
Exterior angles add up to 360 degrees Interior angles add up to 1260 degrees
A nonagon has 9 interior angles that add up to 1260 degrees
The nine interior angles of a nonagon add up to 1260 degrees
It has 9 interior angles that add up to 1260 degrees
A nonagon is a 9 sided polygon and its 9 interior angles add up to 1260 degrees