A scalene triangle has 3 sides of different lengths and 3 interior acute angles that add up to 180 degrees
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A scalene right triangle is a triangle that has no congruent sides and and one right angle.
A right triangle may be isosceles or scalene (though not at the same time), but never acute, since an acute triangle is defined as having all interior angles less than 90°. A right triangle by definition has one 90° angle.
By definition, a triangle has three sides.
An isosceles triangle can never be a scalene triangle but it can take the shape of a right angle triangle
The definition of the word "scalene" is a triangle having three sides of different lengths.The mathematical definition of "symmetry" is an exact reflection of form on opposite sides of a dividing line/plane.Therefore, by definition, no lines of symmetry exist in a scalene triangle.