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no, these are the first 20 triangle numbers:

1 3 6 10 15 21 28 36 45 55

66 78 91 105 120 136 153 171 190 210

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Q: Is 9 a triangle number
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Related questions

What number is an even number a triangle number and a multiple of 9?

36


What is a triangle number an odd number and a multiple of 9?

45


What number is a triangle number an odd number and a multiple of 9?

45, 153, 171, 351...


What number is a triangle number a square and an even number?

36 is a triangle number (1+2+3+4+5+6+8+9), a square (6*6) and an even number.


What is a number less than 20 it is an odd one digit number it is not the number of sides in a triangle and can be divided by three?

It is 9


What triangle has sides that measure 9 in 9 in and 9 in?

If all three sides are 9 inches in length, then it is an EQUILATERAL Triangle. All the angles are 60 degrees.


Can 9 9 17 form a triangle?

Can 9, 8, and 17 for a triangle?


The number is less than 20 it is an odd one-digit numberit is not the number of sides of a triangle it can be divided by three what is the number?

9


What is the number of sides of a triangle multiplied by three?

Ah, triangles are such beautiful shapes, aren't they? So calming and serene. If we take the number of sides of a triangle, which is 3, and multiply it by 3, we get 9. Isn't that just a happy little calculation? Remember, there are no mistakes, just happy little accidents in math and art.


In a triangle prism how does the number of faces compare to the number of edges?

A triangular prism has 5 faces, 9 edges and 6 vertices


What kind of number is 9?

either prime, pentagonal, square or triangle. work it out for yourself.


What kind of triangle has sides with lengths 9 9 and 9?

An equilateral triangle has three sides of equal length.