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?
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).
Triangular prism