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Why aren't cylinders cones and spheres polyhedrons geometry?
polyhedrons need flat face and edges, corners which cylinder cones don't have.
What shape is a shape with 18 edges?
Two polyhedrons have 18 edges: truncated tetrahedron and hexagonal prism.
What is the relationship among the vertices's faces and edges of polyhedrons?
If you add the vertices and Faces and subtract 2 from that number you get the number of edges. Vertices+Faces=Edges+2
Some polyhedrons are neither prisms nor pyramids?
true
How many faces edges and vertices does a star have?
It has 10 vertices, 10 edges, and 0 faces.
Why aren't cylinder cones and spheres polyhedrons?
polyhedrons need flat face and edges, corners which cylinder cones don't have.
How many edges does a rectangle have?
4 edges A rectangle has four edges. A rectangle has 4 sides but no edges which are normally applicable to polyhedrons.
Why aren't cylinders cones and spheres polyhedrons geometry?
polyhedrons need flat face and edges, corners which cylinder cones don't have.
What shape is a shape with 18 edges?
Two polyhedrons have 18 edges: truncated tetrahedron and hexagonal prism.
What is the relationship among the vertices's faces and edges of polyhedrons?
If you add the vertices and Faces and subtract 2 from that number you get the number of edges. Vertices+Faces=Edges+2
Do all polyhedrons have three edges at the vertex?
No. There must be at least three but theyre can be more.
Do all polyhedrons have 2 edges that meet at each vertex?
No. For example, a cube is a polyhedron and 3 edges meet at each vertex.
Are polyhedrons symmetrical?
not all, but some
What two polyhedrons have a total of 20 edges?
pentagonal antiprism, pentagonal deltohedron(not deltahedron), decagonal pyramid, and many more.
What shape has 6 faces 10 vertices's 15 edges?
I believe you intend to talk about a polyhedron if it is a convex polyhedron, there is a relation : F + V * E = 2 (you can experiment with current polyhedrons) the relation is not satisfied by your numbers
How many faces vertices and edges does a rectangle have?
Rectangles are plane (2-dimensional) polygons. Only solid (3-dimensional) polyhedrons have faces.
How many faces vertices and edges are in a triangle?
Triangles are polygons (two-dimensional) . Only polyhedrons have faces, verticles and edges. You could define as triangle as having either one or two faces (top/bottom), three vertices, and three edges.For pyramids and other polyhedrons, F + V - E = 2e.g.- a three-sided pyramid has 4 faces, 6 edges, and 4 vertices.- a four-sided pyramid has 5 faces, 8 edges, and 5 vertices
