0
Area of a nonagon with a circumradius of 2 units is 11.57 square units.
A nonagon is a 2-dimensional figure and so has only one face.
A nonagon is a 2-dimensional shape and so, by definition, its volume must be 0.
-7
A nonagon has 9 sides.
sum_of_interior_angles = (number_of_sides - 2) x 180o
= (9 - 2) x 180o
= 1260o