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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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