Nonagonal Bipyramid Small 147×320 Medium 294×640 Large 471×1024 Download Tiff Original 1379×3000 | (241.8 KB) Download EPS Vector 346.7 KB Description Illustration of a nonagonal bipyramid with hidden edges shown. A bipyramid, or dipyramid, is formed by joining two congruent pyramids at their bases. The bases in this illustration are nonagons. Keywords bipyramids, dipyramid, dipyramids, nonagon, nonagonal bipyramid, two congruent pyramids Galleries Bipyramids Source: Florida Center for Instructional Technology Clipart ETC (Tampa: University of South Florida, 2007)