**TOPIC 3: THREE DIMENSIONAL FIGURES ~ MATHEMATICS FORM 4**

**Three Dimensional Figures**

Sometimes before you make any purchases you may want to know for example, how much cloth you need to make a pillow cover. What about a cover for your mattress or sofa cushion? How much oil paint do you need to paint your

drinking water tank?

drinking water tank?

What about the amount of cloth for the pocket covers of your radio, curtain, suit, gown, trousers, set of table clothes, etc.

Answers to such questions and of the kind leads you to think more carefully about the size of the surfaces (faces) to be covered or coated on the bodies at work. Perhaps you need to take some measurements on the

surfaces.

surfaces.

The knowledge of the surface areas of such bodies will enable you to choose or purchases the required amount without unnecessary wastage so as to minimize purchases costs too.

Three Dimensional Figures

Classify three dimensional figures

*Three***are the**

*‐dimensional objects***you see every day, like boxes, balls, coffee cups, and cans.**

*solid shapes*It is called

**three-dimensional**or**3D**because there are three dimensions:*width, depth*and*height.*-The following table shows examples of some common three dimensional figures

The Characteristics of Each Class

List the characteristics of each class

Here are some helpful vocabulary terms for solids:

**Base**: Is the bottom surface of a solid object.

**Edge**: Is the intersection of two faces on a solid object. This is a line.

**Face**: Is a flat side of a 3‐dimensional object.

**Prism**: Is a solid object with two congruent and parallel faces.

**Pyramid**: Is a solid object with a polygon for a base and triangles for sides.

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