A triangle, as its name suggests, has 3 corners. No more, no less. A triangle itself is 2-D, meaning it is flat. A pyramid would be 3-D.
It also has 3 edges.
Triangles can be of different types:
equilateral - all sides of equal length
isoceles - exactly two sides of equal length and the other of a different length
scalene - no sides of equal length.
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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
a scalene can be a right-angled triangle or a obtuse angled triangle or a acute angled triangle depending on the angles of the triangle.