Polyhedrons

The video tutorial covers various 3D shapes, distinguishing between polyhedrons and non-polyhedrons. It explains the properties of convex and concave polygons, and introduces regular polyhedrons like the cube, tetrahedron, and others. The tutorial also explores Euler's formula, which relates the number of faces, vertices, and edges in polyhedrons.

Which shape has six congruent square faces?

• Cuboid

• Cone

• Cube

• Cylinder

What is a characteristic of non-polyhedrons?

• They have only flat faces.

• They have curved surfaces.

• They have no vertices.

• They have more than three faces.

Which shape is not a polyhedron?

• Cube

• Prism

• Pyramid

• Sphere

Which of the following is a regular polyhedron?

• Tetrahedron

• Square Pyramid

• Cuboid

• Pentagonal Prism

How many congruent triangles make up an octahedron?

• 4

• 6

• 8

• 12

How many faces does a dodecahedron have?

• 10

• 12

• 20

• 8

What is the relationship among faces, vertices, and edges in a polyhedron according to Euler's formula?

• Faces + Vertices - Edges = 4

• Faces + Vertices - Edges = 1

• Faces + Vertices - Edges = 2

• Faces + Vertices - Edges = 3