6 is a triangular number, but 9 is not.
A triangular prism has nine edges and six vertices.
The first six triangular numbers are : 1,3,6,10,15,21. However, sometimes the first triangular number is regarded as 0 (zero) so you then have 0,1,3,6,10,15 as the first six triangular numbers.
8,9,5,7,2 and 1
Six.
A triangular prism.
Triangular prism. 9 faces, six vertices, and nine edges right?
A three-dimensional figure with five faces, nine edges, and six vertices is called a triangular prism. It consists of two triangular bases and three rectangular lateral faces. The triangular bases contribute three edges each, and the three additional edges connect the vertices of the triangles, resulting in the total of nine edges. The six vertices come from the three vertices of each triangular base.
Six corners, nine edges and five faces.
It is a triangular prism.
1, 3, 6, 10, 15, 21
A triangular prism has two three-sided bases and three rectangular lateral faces. A triangular prism has five faces, six vertices and nine edges.
Nine edges (three of them are parallel) and six vertices (corners).