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Q: What 3D figure has 3 triangles?

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A pyramid.

There can be no closed 3D shape with only one square and 3 triangles.

a pyramid

A triangular base pyramid would fit the description.

The simplest pattern is 2n+1, so the 16th figure will have 33 triangles. Of course, if you are creating new triangles and also keeping the old triangles, this would be different.

A triangular prism

A circle is not a 3D figure because it only has two dimensions. A sphere is a 3D "circle".

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.

This would be a triangular prism.

Triangular prism

A net has two equilateral triangles and 3 rectangles. What solid figure might it make?

a star

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