Page 125 - Revised Maths Wisdom Class - 6

Playing With Construction 123

Tools Figures Uses

Divider • To compare lengths

1 2 3 4 5 6 7 8 9
3 • To draw parallel lines
Set-Squares 2 4 3 2 2 1 2
1 7 6 5 • To draw perpendicular lines
1
8
9
10
• To draw angles
Protractor
• To measure angles

We have already learned how to use ruler, divider and protractor in previous class.
We shall learn using the compasses and set squares in this chapter.

A compass is an instrument consisting of two arms, joined at one end. One of the arms is
pointed and the other arm has a provision to hold a pencil. It is used to draw arcs and circles
and mark equal lengths.

Construction of a Circle when its Radius is Known
Let us construct a circle of radius 3 cm following these steps:
Step 1: Stretch the compass to measure of radius 3 cm.

Step 2: Mark a point O as the centre of the circle.
Step 3: Place the pointed end of the compass at O.
Step 4: Swing the pencil end of the compass all around to obtain a circle.

Remember!er!
Rememb
› Two or more circles having same centre
are called concentric circle.
0 1 2 3 4 5 6 7
cm Concentric circles have different radii.
inch ›
0 1 2 3

Construction of Wavy Wave
Before constructing any wavy wave, we have to draw this by free hand
like the given aside.
4 Q R
Here, PQR is called the central line. P 4

If the length of the central line is not specified then we can take this to be
of any length. Here we assume PR = 8 cm.