for a triangle to be an isosceles triangle, two of its sides and its corresponding angle must be equal. all isosceles triangles have at least one line of symmetry
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Three, Isoceles, Scalene & Equilateral.
Pentagons can be symmetrical, but are not always so.
Scalene Triangle. Isoceles triangles have 2 equal lengths (Trick: 2 eyes), Equallateral triangles have all equal sides. Self explanatory...
0An equilateral triangle has 3An isoceles triangle has 1All other triangles have 0
Thay aren't. A scalene triangle has 3 uncongruent sides. While an isoceles has only one uncongruent.