Yes, the sum of any two sides is always greater than the third side:
9 + 4 > 11
4 + 11 > 9
11 + 9 > 4
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11, 4, 8
Yes and it will be a scalene triangle
if the angle of a triangle are in the ratio 7:11:18,find the angle
It can be but need not be.
A scalene triangle. It also happens to be acute.