It is known that the lengths of a, B and C on three sides of a triangle ABC are integers, and a is less than or equal to B and less than or equal to C. If b = m (m ∈ positive integer), then such a triangle has I know the answer is m (M + 2) / 2, but I don't know why There are several (in M)

It is known that the lengths of a, B and C on three sides of a triangle ABC are integers, and a is less than or equal to B and less than or equal to C. If b = m (m ∈ positive integer), then such a triangle has I know the answer is m (M + 2) / 2, but I don't know why There are several (in M)

The sum of the two sides is greater than the third side

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