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Q: What is a solid figure with one angle that is a polygon and three or more faces that are triangles with a common vertex?

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A hexagonal pyramid.

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I need help with that too!

A pyramid is a solid figure with one face that is a polygon and three or more faces that are triangles with a common vertex. Yeah, pg. 114 in the math workbook is a little hard, and the guy who answered this before me thought it was funny to improve the answer by saying the answer was 45. That's just not mature. I don't get it. Anyway, I hope you finish your homework at this rate.

A pyramid

A pyramid has a polygonal base with all other sides being triangles. As the Egyptians famously demonstrated, a common pyramid has a square base with four triangles meeting at a vertex, but any polygon - regular or irregular - can be used as the base of such a polyhedron.

Two triangles can be formed by the diagonals of one vertex of a four-sided polygon.

18 triangles

triangular prisum

A tetrahedron (4 faces) or triangular bipyramid (5 faces).

It is a pyramid

A pyramid is an object with one face as a polygon with any number of sides and the other faces as triangles with a common vertex.

A polyhedron of which one face is a polygon of any number of sides, and the other faces are triangles with a common vertex.

21

Number of sides minus 2 equals the number of triangles within the polygon.

It is: 8-2 = 6 triangles

Any n-sided regular polygon, by joining a single vertex up to each of the others, will have a total of (n - 2) triangles inside. In this case, an 11-sided polygon will contain 11 - 2 = 9 triangles.

pyramid An pyramid is a geometric solid of the shape made famous by the royal tombs of ancient Egypt. It is a solid whose base is a polygon and whose lateral faces are triangles with a common vertex

Since every triangle can be split into two triangles simply by drawing a line from any vertex to the side opposite that vertex, the answer to the question is that there can be no rule to find a number that is infinite.

98

98