No.
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Use Pythagoras' Law. In other words, check whether 62 + 92 = 112 (11 is the largest side). If the equation is correct, then it is a right triangle. If not, it isn't.
right angle triangle
The isosceles triangle has a perimeter of: 14+14+9 = 37 feet
No, it is not. For a right triangle, from the Pythagoraen theorem, 7 squared plus 9 squared does not equal 12 squared
No and indeed not any kind of triangle.