No, it is not.
For a right triangle, from the Pythagoraen theorem, 7 squared plus 9 squared does not equal 12 squared
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No, they do not represent a right triangle.
if it makes a right angled triangle then c squared = a squared + b squared 12^2 = 7^2 + 9^2 144 = 49 + 81 but 144 doesn't equal 130 so no it doesn't make a right angle triangle
that's not a triangle
No
12, 7, 7