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There are 9 edges in a triangular prism, hope this helped.
yes it is!EDIT: No, it is not.
Is 63 a triangular number I think it is a triangular number.
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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??