An octagonal pyramid has eight triangles on an octagonal base.
An octahedron can also be made by putting a square pyramid on another inverted square pyramid. This shape has just eight triangles and no others.
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An octahedron.
The cone IS a 3d figure.
This would be a triangular prism.
A triangular prism.
A net has two equilateral triangles and 3 rectangles. What solid figure might it make?