Scalene Triangle. Isoceles triangles have 2 equal lengths (Trick: 2 eyes), Equallateral triangles have all equal sides. Self explanatory...
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scalene triangle
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A scalene triangle is one that has three lengths of different sizes. It is quite possible for a right triangle to have three sides of different length.
You add together the lengths of its three sides.
Depending on the triangle, there can be 0, 1, or three lines of symmetry. A scalene triangle (all sides of different lengths) will have no lines of symmetry, an isosceles triangle (exactly two sides of the same length) will have one line of symmetry, and an equilateral triangle (all three sides of the same length) will have three lines of symmetry.