Any triangular structure. The triangle is used in building structures like towers and bridges because the three sides of a triangle, when locked together at their ends, are very strong and do not change shape. It's one of the most important shape in constructions. The circle is another important shape too.
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It is a 2D shape
2D - the triangle 3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
this is the shape of 2d cone
It's a 2D shape.
it a triangle as a 2d shape