Class 6 chapter 5 is **Understanding Elementary Shapes.** The chapter teaches students how to measure a line segment, about different types of polygons and their properties, triangles and their types. The new concept of angle and its measurement is introduced. A slight gist of solid or 3 D shapes towards the end of the chapter. MSVGo is a one-stop solution to enhance your knowledge and understanding of the subject at a very affordable price. All the topics of class 6th science are effortlessly explained on the MSVGo app. We provide notes, videos, numerous practice questions, and NCERT solutions for each chapter from class 6th to 12th. Download the MSVgo App for free and kickstart your journey of becoming a champ.

Topics covered in this chapter |

Measuring Line Segments Angles and its Types Triangles and their Types Polygons Quadrilaterals Solid Shapes or 3D Shapes Perpendicular Lines |

A line segment is a defined portion of a line. Line segments are measured by comparing their lengths. There are several ways to compare the length of line segments, such as:

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**(i) Comparison by observation:** This is an eyeballing method; by just looking at the length of 2 line segments, we compare them. This method could prove inaccurate if there is a very small difference in the lengths.

**(ii) Comparison by Tracing:** The idea behind tracing is to put one line segment over the other to compare the lengths. A tracing paper is used to trace one line, and then it is put over the other to check which one is longer or shorter. Although it is comparatively an accurate method, it's very cumbersome.

**(iii) Comparison using Ruler and a Divider:** Ruler (scale) and divider are measuring geometrical instruments.

**Ruler: **a standard size ruler used by students is divided into 15 equal parts by marking. Each part is equal to 1cm, which is further divided into 10 parts of 1mm each. For e.g., to measure a line segment AB of 6.7cm on a ruler, we will measure 7 cm and 7mm. The ruler is marked from 0 cm to 15 cm. Position error can occur while measuring if the ruler is not placed.

**Divider: **A divider has 2 open ends that can stretch up to 180 degrees apart. To use the divider, open the divider and place its one end at point A of the line segment AB and the other end on point B. Now, without disturbing the opening of the divider, place it over the ruler. The distance of one end of the divider from the other is equal to the length of the line segment AB.