It is also a decagonal number and a pentagonal pyramidal number. It has 12 regular decagonal faces, 20 regular triangular faces, 60 vertices and 90 edges. The H3 decagonal projection shows the plane of the van Oss polygon. The decagonal prism has 12 faces, 30 edges, and 20 vertices. The tower was attached to the west end of the decagonal body of the church. It is also a centered decagonal number. It is a hemipolyhedron with six decagonal faces passing through the model center. Fifty-two is the 6th Bell number and a decagonal number. The two dodecahedra project onto the decagonal faces of the envelope. It is both a decagonal number and a centered 11-gonal number. The Kara Koyunlu mausoleum has a decagonal plan. The round, aluminum bronze dollar coin was replaced in 1989 with a decagonal, cupro-nickel type. A nickel-brass, decagonal 1 dollar coin was introduced in 1990. It is a decagonal building with a single, central column that twenty ribs rise from. It is a decagonal number, a 19-gonal number, and a centered 29-gonal number.