All right angle triangles have a 90 degree angle and two acute angles that add up to 90 degrees.
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A triangle has no right angles when it is not a right angle triangle as for example as in the case of an equilateral triangle that has 3 equal 60 degree angles.
A scalene triangle is a triangle that does not have a right angle in it (i.e. not a right angled triangle) and does not have two (or three) sides with the same length (i.e. not an isosceles triangle or an equilateral triangle). An example is a triangle with sides of length 4cm, 5cm and 6cm.
Finding the sides of any triangle that is not a right angle triangle
If you meant scalene triangle, then it may have a right angle. By definition, a scalene triangle is a triangle with no angle or side measures that are the same. For example, a 30,60,90 triangle is scalene.
How about a right angle triangle as an example.