A triangle has 3 sides (or edges) and 3 corners (or angles)
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A triangle consists of three corners and three edges.
It has 4 corners.
A triangle has 3 sides (edges) and three vertices (corners)
A triangular-based pyramid has 4 corners, 4 faces and 6 edges.
A three dimensional triangle is also known as a pyramid. In a triagonal pyramid, there are six edges and four corners.