Geometry: Three Dimensional Solids
What is a Three Dimensional Solid? Sometimes called Space figures Figures whose points do not all lie in the same plane. They are not flat like polygons
3 dimensions It is called three-dimensional, or 3D because there are three dimensions: width, depth and height
Parts of a 3D Solid Edge: A line segment where two faces of a solid meet
Parts of a 3D Solid Face: Flat surface of a solid, you can slap it
Parts of a 3D Solid Vertex: A point where two or more edges meet the “pointy” part
Solids
What is a net? When you take a solid apart and lay it down flat you get a NET! Can you guess which net makes up which solid?
Cube
Net for a Cube
Sphere
Cone
Cylinder
Net for a Cylinder
Pyramid ***Has a square on the bottom face, not a triangle***
Net for a Pyramid
Tetrahedron or Triangular Pyramid Has a triangle at the base, not a square
Net for a Tetrahedron
Prism Has the same shape on both the top and the bottom Looks like it has been stretched out
Nets for Prisms
Now let’s practice!
Which solid is this? How many faces does it have? How many vertices does it have? How many edges does it have?
Which solid is this? How many faces does it have? How many vertices does it have? How many edges does it have?
Which solid is this? How many faces does it have? How many vertices does it have? How many edges does it have?
3D Solids are EVERYWHERE Try to find the all the solids in the following pictures