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Q: What 3D figure has eight triangles?

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A pyramid.

a pyramid

A triangular pyramid. It has triangles on its 3 sides and a triangle on the bottom for a base.

A triangular base pyramid would fit the description.

An octahedron.

Maltese or Iron Cross!

how many triangles are in a eight sided figure

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

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.

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A tetrahedron has four equilateral triangles as sides

A hexahedron. A parallelepiped, cuboid, quadrilateral frustum are examples.

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