Only two equal side lengths
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'Isocoles' and 'Equalateral' triangles are, scalene, right angled, and obtuse triangles are not.
any triangle is a triangle
acute angled triangle,right angled triangle,obtuse angled triangle,isosceles triangle,equilateral triangle, scalene triangle
An equilateral triangle perhaps depending on your meaning of 'ON the triangle'
equilateral triangle , isosceles triangle , scalene triangle