pentagonal square
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An octohedron, or diamond
2 equilateral triangles
A triangle has three faces. In geometry, a face refers to a flat surface of a solid shape. Since a triangle is a two-dimensional shape with three sides, it has three faces. Each side of the triangle forms one of its three faces.
In the instance of a triangle it is equilateral. Most quadrilaterals have equal sides as well (such as a rectangle with two sets of equal sides).
Any irregular shape, for example a irregular hexagon is a 6 sided shape with no equal sides circle has no sides... scalene shapes. like a scalene triangle. ...i dunno hwo to spell it though.