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    BRIDGE BACK

                      Observe the following 3D models:

                      (a)  Have you ever used any designing or 3D modelling software to create something?
                      (b)  How do you think different shapes and components come together?

                     In  school  and daily  life, you  often  need  to  make  models,  solve problems  or share ideas.
                     Drawing by hand can take a lot of time. Software like AutoCAD, Blender, SketchUp, SolidWorks
                     and others help with designing. In this chapter, you will learn about Tinkercad, a fun and easy
                     computer-aided design tool that lets you create 3D models and show how things work on your

                     computer.

                            UNDERSTANDING 2D AND 3D SHAPES

                     In  daily  life,  you  must  have seen many two-dimensional  and three-dimensional  shapes.
                     Understanding the basic difference between them is important, especially when you are going
                     to learn about three-dimensional modelling and design.

                     WHAT ARE TWO-DIMENSIONAL SHAPES?

                     Two-dimensional shapes have length and breadth, but no depth or height. They can be drawn on
                     a flat surface and have an area and perimeter. These shapes are visible only on a screen or paper.
                     Some examples of two-dimensional shapes are:

                                           Circle                Rectangle                   Square

                     WHAT ARE THREE-DIMENSIONAL SHAPES?

                     A three-dimensional shape has three dimensions: length, width and height. These shapes take up
                     space and can be held in real life. These shapes can be viewed from different angles.

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                                                                                             Tinkercad–Shape Your Ideas

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