Understanding Elementary Shapes Class 6 Notes CBSE Maths Chapter 5 [Free PDF Download]

Measurement of Line Segment:

• A line segment is defined as a segment of a line that is fixed in place. This enables the measurement of a line segment.

• The length of a line segment is the distance between its endpoints.

• When comparing the lengths of line segments, a graduated ruler and a divider are used. These methods give accurate length distances.

• Also, we can compare the two line segments by observation or with the help of trace paper. But, both the methods have very little accuracy and we can’t trace the lengths every time.

Angles – ‘Right’ and ‘Straight’:

• An example of an angle is when the hand of a clock shifts from one location to another.

• A right angle is used to turn from north to east.

• A full turn is made by turning in the same direction by two straight angles (or four right angles).

• The angle for one revolution is called a complete angle.

• One revolution's angle is a full angle.

• A protractor is used to calculate the size of an angle in degrees.

• A $\dfrac{1}{4}$ revolution is a right angle, whereas a $\dfrac{1}{2}$ revolution is a straight angle.

(a)

(b)

(c)

• From above, 

Clock $1$ represents $\dfrac{1}{2}$ of revolution or $2$ right angles.

Clock $2$ represents $\dfrac{1}{4}$ of revolution or $1$ right angles, and

Clock $3$ represents $\dfrac{3}{4}$ of revolution or $3$ right angles.

• A right angle is $\dfrac{1}{4}$ a revolution and a straight angle is $\dfrac{1}{2}$ a revolution.

• Protractor is an instrument used to measure the size of an angle in degrees.

• The measure of a right angle is ${{90}^{0}}$ and hence that of a straight angle is ${{180}^{0}}$.

• An angle is said to be acute if its measure is less than that of a right angle and is said to be obtuse if its measure is more than that of a right angle but is less than a straight angle.

• Sea-saw, rooftop, opening book, etc. are examples of an acute angle.

• House, desk for book reading, etc. are examples of an obtuse angle.

• A reflex angle is larger than a straight angle.

• Two intersecting lines are perpendicular if the angle between them is ${{90}^{0}}$.

• The perpendicular bisector of a line segment is perpendicular to the line segment that divides it into two equal parts.
  
  

Triangles Can Be Classified As Follows Based on Their Angles:

Angles – ‘Acute’, ‘Obtuse’ and ‘Reflex’:

• An acute angle is an angle smaller than a right angle.

• An obtuse angle is one that is greater than a right angle but smaller than a straight one.

• A reflex angle is more than twice as large as a straight angle.
  
  

Triangles can be classified as follows based on the lengths of their sides:

Polygons are named based on their sides: 

Quadrilaterals are further classified with reference to their properties:

Faces, Edges, and vertices:

We see around us many three-dimensional shapes. Cubes, cuboids, spheres,

Cylinders, cones, prisms, and pyramids are some of them.

• Each side of the cube is a flat surface called a flat face (or simply a face). 

• Two faces meet at a line segment called an edge. 

• Three edges meet at a point called a vertex.

Prism:

• The triangular prism has a triangular base, whereas the rectangular prism has a rectangular base.
  
  

Understanding Elementary Shapes Notes - Free Download

Our experts at Vedantu had put an extensive effort to formulate Class 6 Maths Chapter 5 notes in a short and precise manner. The students can effectively use the Class 6 Maths Chapter 5 Notes to have a quick revision of the topic just before the examination.

It is mandatory to study all the important concepts related to different geometrical figures given in Understanding Elementary Shapes Class 6 Notes in order to score better marks in the exam and to have a thorough understanding of the important topics given in the chapter. As the chapter is so vast, we have segregated the chapter in different sections. A detailed explanation of every topic is provided in our Class 6 Maths Chapter 5 notes. These detailed explanations will help students solve every question given in different exercise productions.

Students can make use of Understanding Elementary Shapes notes and gain the necessary information to prepare the complete chapter in a better way. Instead of studying the last minutes, all students need to do is to refer to Class 6 Maths Chapter 5 notes, as they are very precise and all the important concepts are explained extremely well. With this, students will surely be able to answer all the Understanding Elementary Shapes questions that may come up in the examination.

Rather than cramming the last minute for their examination and getting useless stress, the Understanding Elementary Shapes notes can be used in a smart way to gain the best out of it for the exam. Students can also evaluate their strengths and weaknesses and prepare the chapter accordingly to score maximum marks in the exam. The  Understanding Elementary Shapes notes are available free of cost. Students can download  Understanding Elementary Shapes notes in a PDF format just with a  single click on the PDF link given below.

Understanding Elementary Shapes Introduction

We can see many different shapes around us that are drawn using curves or lines. We can see open curves, close curves, edges, corners in our surroundings. We use them to form angles, circles, triangles, line segments, and polygons of different sizes and measurements. In this chapter, we will learn how geometrical shapes such as triangles, circles, polygons, etc of different sizes and measurements are constructed using a ruler or divider.

The chapter Understanding Elementary Shapes is divided into 10 sections and 9 exercises.

• The first section is the basic introduction to Understanding elementary shapes having examples from the surroundings that are formed using curves or lines.

• The second section introduces the methods of comparing two or more than two line segments of different lengths.

• The third section introduces the concept of right angle and straight angles by directions.

• The fourth section introduces different angles such as acute angle, obtuse angle, right angle, straight angle, and reflex angle.

• The fifth section discusses how to measure different angles using the protractor and ruler.

• The sixth section discusses perpendicular lines and their constructions.

• This seventh section introduces different types of a triangle like a scalene triangle, an equilateral triangle, an isosceles triangle, an acute angle triangle, an obtuse angle triangle, and a right-angled triangle.

• The eight sections introduce different types of quadrilaterals such as rectangle, square, parallelogram, rhombus, and trapezium.

• The ninth section introduces a classification of polygons on the basis of their sizes and vertices.

• The tenth section introduces three-dimensional shapes such as cone, cube, cylinder, pyramid, and sphere. This section also discusses the number of faces, edges, and vertices in different three-dimensional shapes.
  
  

Benefits of Understanding Elementary Shapes Notes by Vedantu

• Understanding Elementary Shapes Class 6 Notes have been prepared in accordance with the latest academic year syllabus so that students don't find any confusion if any changes have been made by the CBSE board.

• Prepared by the teachers who have extensive experience and know what exactly is required to mention.

• The students will be able to observe short keynotes of the chapter that will boost their exam preparation.

• Available in a free downloadable PDF format so that students can easily refer to it when required.

• Vedantu made an effort to facilitate the students with the perfect Class 6 Maths Chapter 5 notes which definitely assure them to get better marks.