Page 117 - Maths Skill - 6

Playing With Construction 115

C. Write ‘T’ for true and ‘F’ for false Statements

1. In a scalene triangle, all the three sides are of equal in length.

2. Each angle of an equilateral triangle measures 60°.
3. Two sides of an isosceles triangle are equal in length.

4. The sum of the lengths of any two sides of a triangle is always smaller than the length of the third side.

Introduction

Everything we see around us has a shape. Even the book you are reading has a shape. We have already learned
about some simple shapes and how to draw them. In this chapter, we will learn about some basic constructions
like drawing circles, squares, rectangles and some special figures. For these we will use various instruments like
ruler, compass, protractor, divider and set squares available in our geometry box. Our geometry box contains the
following tools, which we use:

Tools Figures Uses

Ruler 0 cm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 • To draw line segments
0 inch 1 2 3 4 5 6 • To measure line segments

• To mark equal lengths
A pair of Compass • To draw arcs
• To draw circles

Divider • To compare lengths

1 2 3 4 5 6 7 8 9
3
• To draw parallel lines
Set-Squares 2 3 2 2 1
• To draw perpendicular lines
2
4
5
1 7 6
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.