Irregular Concave Octagon Small 247×320 Medium 495×640 Large 792×1024 Download Tiff Original 2319×3000 | (74.4 KB) Download EPS Vector 332.0 KB Description Illustration of an irregular concave octagon. This polygon has some symmetry. Keywords 8 sides, concave, eight sided, geometric shape, Irregular, octagon, polygon, symmetry Galleries Decagons Source: Florida Center for Instructional Technology Clipart (Tampa: University of South Florida, 2007)