yes, the shorter sides are 6.6 and 8.8 and the hypotenuse is 11, by Pythagorean theorem
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No
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.
If you mean dimensions of 11, 60 and 61 then yes they will form a right angle triangle.
No.
55A = ab/2