Introduction
Chapter Name : Introduction To Graphs |
Sub Topic Code : 104_08_15_01_02 |
Topic Name : Introduction |
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Sub Topic Name : Pie Graph |
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Introduction
What is a Pie graph?
Pre-Requisites:
Basic knowledge about proportions and graphs
Activity:
The sector of the pie graph gives the number of bands of a particular color used in the construction of the given structure.
Real Life Question:
What percentage of disk space is free on a local disk on hard drive?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Graph Pie Graph | A graph is an abstract representation of a set of objects where some pairs of the objects are connected by links A pie graph or a pie chart is useful for showing the proportion of each data value to the whole |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Rubber bands of different colors | Scale each rubber band according to its color in feet. Ask the student to form the front view of a 100x40 foot building using different bands. Represent the data using a pie graph with the total number of bands equal to 360 degrees. Take ratios of different colored bands used and find their equivalent angles and draw the chart. |
Real life uses :
Representation of sales, surveys, numbers
Practical examples around us
| Examples | Explainations |
|---|---|
| Sales Surveys | The sales of various products of a company are shown using pie graph with each product represented in each sector. Surveys use pie graphs to represent the data found with each value given in each sector of the chart. |
What you learn in Theory:
A pie graph is used to compare parts of a whole. Each part is compared with the whole and its ratio is taken. Using the ratio the equivalent angle of the sector is found out.
What you learn in Practice:
Using various scaled bands of different colors, the structure can be formed uniquely in different ways using different number of different bands. Each band is represented by a sector. The number of bands in a particular sector is given by the product of the ratio of angle of sector to whole and the whole number of bands used.