Three unequal sides and angles
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It's a triangle where the lengths of all 3 sides are different.
The 3 interior angles of a scalene triangle add up to 180 degrees
Right Angled triangle Isoceles triangle Equalateral Acute scalene triangle Obtuse scalene triangle equalatrial isosilies scaline
There is no formal definition: it is any side of a triangle. Often, if the triangle has a horizontal base, then it is one of the sloped sides. In a right angled triangle, it is one of sides adjacent to the right angle. In an isosceles triangle, it is one of the equal sides.
A triangle by definition only has 2 dimensions.