Q: Is 9 a triangular number

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45

There are 9 edges in a triangular prism, hope this helped.

28 is a triangular number because it is the sum of the integers 1 through 7. The next larger triangular number is 36, the sum of the integers 1 through 8. Therefore 26 is not a triangular number. Notice 28 = 7 times 8 divided by two and 36 = 8 times 9 divided by two. So what's the next triangular number??

Is 63 a triangular number I think it is a triangular number.

013

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Only 9 and 15 are odd so the rest can be rejected. 9 is not a triangular number so only 15 is odd and a triangular number.

6 is a triangular number, but 9 is not.

45

36 is a triangular number. The formula for the nth triangular number is, n(n + 1)/2. So, 36 is the 8th triangular number : 8 x 9/2 = 36

There are 9 edges in a triangular prism, hope this helped.

9

Yes, sum of integers 1 - 9.

28 is a triangular number because it is the sum of the integers 1 through 7. The next larger triangular number is 36, the sum of the integers 1 through 8. Therefore 26 is not a triangular number. Notice 28 = 7 times 8 divided by two and 36 = 8 times 9 divided by two. So what's the next triangular number??

Is 63 a triangular number I think it is a triangular number.

013

no it is not a triangular number

Decimal triangular number it is