### Theory:

We see a lot of objects with different shapes and sizes around us.

We have also learnt about different shapes and their names in the earlier classes.

It is easy to draw a rough figure of a geometrical shape.

But how do you think shapes of specific measurements get constructed?

For that matter, we use specific geometric tools.

Nowadays, a geometry box comes with all the geometrical tools necessary.

Let us now look at each of the tools in detail.

 Name Tool Description Use A ruler A rectangular tool with measurements on it. The measurements are in centimetres, millimetres and inches. To draw a line segment with exact measurements. To measure lengths. A compass A tool with two ends. There is a pencil on one end, while the other is a pointy end. To construct line segments, figures and so on. A divider A tool similar to the compass. Unlike the compass, it has two pointy ends. To divide a line segment into many equal parts. Set squares Two triangular tools. One has the angles $$45^\circ$$, $$45^\circ$$, and $$90^\circ$$ at its vertices, while the other has the angles $$60^\circ$$, $$30^\circ$$, and $$90^\circ$$ at its vertices. To draw both perpendicular, and parallel lines. A protractor A semi-circular tool. It has measurements from $$0^\circ$$ up to $$180^\circ$$. To draw and measure angles.