## Tuesday, 1 May 2012

### Three Dimensional Geometric Objects

All of the photographs in this post were taken by the Grade 2 students.   We were looking at real world objects that look like geometric shapes that we are studying in class.  We know that what we learn in math class is important to use in the real world.  We can see geometric shapes all around us.

The basketball, globe and lanterns reminded us of spheres.  Spheres are almost like a ball but they don't bounce. This shape has no vertices or faces or edges.

We looked at the traffic cone and the sharpened end of a pencil.  This 3-D object has one face, one vertex and one edge.  3-D means that you can measure the object three ways:  side to side, top to bottom and front to back.  We are three dimensional!

The gluestick, the water bottle and the pencil sharpener are all cylinders.  Cylinders have two faces, two edges and zero vertices.  They remind us of a can.

The box and the VHS/CD player remind us of rectangular  prism.  It has 6 faces, 8 edges and 12 vertices.
Guess what!  A cube also has 6 faces, 12 vertices and 8 edges!
Here is a rectangular pyramid.  We couldn't find a triangular pyramid in our classroom.  This one has 5 faces, 8 edges, and 5 vertices.  Do you know where to find faces, edges and vertices?  Here's a hint:
Faces are flat and they are usually 2-D shapes like a square or triangle.
Edges are the sides that join the faces together.
Vertices are the pointy corners where all the edges meet.
If you only have one vertice, it is called a vertex.
The Grade Two students were the ones who told the teacher what to keyboard into the blog today! Aren't they smart?