A triangle in which no sides are the same length
A scalene triangle is a triangle in which
all three sides have different lengths.
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A scalene triangle is one where all the angles are different and all the lengths of the sides are different. A standard 3, 4, 5 triangle does fit the definition of a scalene triangle, but we would alway refer to it in the more specific case, in this case a right angled triangle.
Scalene Triangle
a scalene triangle has no lines of symmetry
A scalene triangle has three sides of different lengths. A right triangle can be scalene - for instance the '3-4-5' triangle has a right angle opposite the side which is 5 units long.
It is an obtuse scalene triangle.