An octohedron, or diamond
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triangular prism triangular prism * * * * * The correct answer is an octagonal pyramid.
octagonal pyramid :)
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.
An acute angled scalene triangle.
Use Pythagoras' theorem: 82-52 = 39 and the square root of this is 6.244997998 or 6.245 feet in height to 3 d.p.