Answer: Yes, a triangle is formed; it is a scalene triangle.
Distance formula: \(d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\).
\[LM=\sqrt{11^2+7^2}=\sqrt{170}\approx13.04\]
\[MN=\sqrt{1^2+11^2}=\sqrt{122}\approx11.05\]
\[LN=\sqrt{12^2+4^2}=\sqrt{160}\approx12.65\]
The sum of the two smaller sides (≈ 23.7) is greater than the largest (≈ 13.04), so the points are not collinear and a triangle is formed. All three sides are different, so it is scalene.