Irregular Concave Nonagon Small 320×247 Medium 640×493 Large 1024×789 Download Tiff Original 3893×3000 | (217.8 KB) Download EPS Vector 377.9 KB Description Illustration of a nonregular/irregular convcave nonagon. A nonagon is a closed geometric figure with 9 sides. Keywords closed polygon, concave, geometric shape, Irregular, nine sides, nonagons, nonregular, polygons, shapes Galleries Nonagons Source: Florida Center for Instructional Technology Clipart ETC (Tampa, FL: University of South Florida, 2009)