8th Math NCERT Chapter 4
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Important Topics in the Chapter "Data Handling":
1. Data Collection and Representation:
– Summary: Data is collected to study a situation, organized systematically, and often represented graphically with tools like pictographs, bar graphs, and double bar graphs.
2. Types of Graphs:
– Summary: Different types of graphs are used to represent data, such as pictographs (using symbols), bar graphs (heights proportional to values), and double bar graphs (comparing two sets of data).
3. Circle Graphs or Pie Charts:
– Summary: Circle graphs show the relationship between a whole and its parts, with sectors representing different proportions of the whole. The total angle in a circle is 360°, and sectors' central angles can be calculated accordingly.
Summary:
The chapter covers the fundamental concepts of data handling, including collecting, organizing, and graphically representing data using pictographs, bar graphs, double bar graphs, and circle graphs (pie charts). Students learn how to interpret different types of graphs and understand the proportional relationships represented visually.
What is data and how is it collected?
Explain the difference between a pictograph and a bar graph.
What type of information can a double bar graph represent?
How is a circle graph (pie chart) useful in representing data?
In drawing a pie chart, how are the central angles of the sectors calculated and utilized?
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