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Q: Are nine and six triangular numbers?

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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.

A triangular prism has two three-sided bases and three rectangular lateral faces. A triangular prism has five faces, six vertices and nine edges.

It is a triangular prism.

Triangular prism. 9 faces, six vertices, and nine edges right?

1, 3, 6, 10, 15, 21

Triangular prism

Nine edges (three of them are parallel) and six vertices (corners).

Six and nine

The first six triangular numbers are 1, 3, 6, 10, 15 and 21.

Six corners, nine edges and five faces.

None. There is nobody to whom triangular numbers belong.

Make an hexahedron in the form of a triangular dipyramid. See link for images.

5,5,5,5,5,14

Triangle numbers or triangular numbers are those numbers that can form an equilateral triangle when counting the objects. The first five triangular numbers are: 1, 3, 6, 10, 15.

Fifty-four divided by six is equal to positive nine because fifty-four and six are both positive numbers.

Triangular prism

614.2

6,400,927 in numbers

No, the numbers 1,1+2, 1+2+3, 1+2+3+4, 1+2+3+4+5... are triangular numbers.

triangular prism

1,36,1225,41616,1413721