SOLIDS -- STRAND/GEOMETRY Lesson 2

FOCUS QUESTION

What are the properties of solid figures?

SPECIFIC OBJS.

1. Recognize faces, edges, vertices of solid and classify solids according to the number and shape of their faces.

2. Classify solids as prism and pyramids.

3.  Represent and solve problems using geometric models

CONTENT SUMMARY

Solids have faces, edges and vertices.  The faces are the flat surfaces of solids. The edges are the places where two faces meet. The vertices are the corners. Singular vertex, plural vertices.

Solids are three-dimensional shapes.   A prism is a solid, with two parallel faces called bases. The other faces are always parallelograms. The prism is named by the shape of its base.  A solid is a pyramid if it has 3 or more triangular faces sharing a common vertex. The base of a pyramid may be any polygon.   An edge is formed where two faces meet.   A vertex is the point where three or more faces meet. 

ENGAGE

Students, let's review what solids are.

What are the characteristics of solids.

Quickly name the solids below and tell me the number of faces, edges and vertices each has.

EXPLORE

Let us take some more time to examine the solids again. I want you to look at the shape of their faces.

Find a partner, manipulate the solids and complete the table below. 

SOLIDS	SHAPE OF FACES
Square-based pyramid	1 square at base, 4 triangular faces
Cube	6 square faces
Cylinder
Cone
sphere
Triangular pyramid/tetrahedron
cuboid
Triangular based prism

Now students , the solids we have been exploring can be categorized in two groups. PRISMS and PYRAMIDS. Have you ever heard of these terms before? Try to find working definitions for the terms. You may use your dictionaries or the internet.

We will now watch this video clip to gain more insights.

Let us read the chart below.

EXPLAIN

Differentiate between prisms and pyramids.

Name at least 4 of each.

EXTEND/ELABORATE

Learn more about prisms & pyramids.

EVALUATE

1. Name the prisms and pyramids below.

2. Study the diagram below, then answer the questions that follow.

(a) Name the solid.

(b) Answer TRUE or FALSE.

    (i)  The solid has 8 edges.

    (ii) The solid has 4 vertices.

    (iii) All the faces are triangular.

    (iv) Opposite sides of the base in the solid are not equal in length.

    (v) The solid is an example of a prism.

3. 

3. 

4.