No.
To form a triangle the sum of the shorter two sides MUST be greater than the longer side.
6 + 5 = 11 < 12 → cannot be a triangle.
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false apex
These dimensions do not form a triangle.
As given 51213 is just a number. However, a triangle with sides 5, 12, & 13, forms a classic Pythagorean right angled triangle.
Yes, because they comply with Pythagoras' theorem for a right angle triangle.
Any triangle whose sides form a Pythagorean triple, eg 3-4-5 or 5-12-13