Answer:
Obtuse Triangle.
Explanation:
The Pythagorean Theorem helps us to Classify Triangles according to its sides.
If
, then lengths a, b, and c make up an acute triangle.
If
then lengths a, b, and c make up the sides of an obtuse triangle.
If
Then the length a,b,c make a right triangle.
The given sides are 5,7 and 11.

Or 74<121
Or

So given triangle is obtuse triangle.