All triangles have 3 sides and 3 interior angles that add up to 180 degrees.
If you know the lengths of 2 sides of a triangle then the length of the 3rd side can be found by using trigonometry.
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No. Angles don't have anything called a side length. However, one can use trigonometry to compute the angles of a triangle based on the side lengths of the triangle (triangles do have side lengths).
Because all side lengths are different, it must be a scalene triangle.
Only two equal side lengths
Yes and the given lengths would form an isosceles triangle.