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Question

is a triangle two dimensional or three dimensional shape

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Solution

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted triangle ABC. In geometry any three points, when non-collinear, determine a unique triangle and a unique plane (i.e. a two-dimensional space). Since, a triangle can be constructed on two-dimensional plane, such as a page of a notebook, blackboard etc, hence triangle is a two-dimensional figure.

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