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Introduction to Graphs Class 8 PPT

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 Page 1


8/3/2019 1
Graphs
Page 2


8/3/2019 1
Graphs
8/3/2019 2
Today I want you to help 
me make a graph. 
I want to make a graph that shows 
the change in temperature 
throughout the day yesterday.
What kind of graphs could we 
make to show this?
Page 3


8/3/2019 1
Graphs
8/3/2019 2
Today I want you to help 
me make a graph. 
I want to make a graph that shows 
the change in temperature 
throughout the day yesterday.
What kind of graphs could we 
make to show this?
8/3/2019 3
Bar Graph vs Line Graph
? What is the difference 
between a bar graph 
and a line graph?
Page 4


8/3/2019 1
Graphs
8/3/2019 2
Today I want you to help 
me make a graph. 
I want to make a graph that shows 
the change in temperature 
throughout the day yesterday.
What kind of graphs could we 
make to show this?
8/3/2019 3
Bar Graph vs Line Graph
? What is the difference 
between a bar graph 
and a line graph?
8/3/2019 4
Line Graph
?A line graph is a graph used to 
show change over time!!
What can time be measured in???
Seconds - Minutes - Hours – Days -
Weeks - Months – Years - Decades -
Centuries - etc.
Page 5


8/3/2019 1
Graphs
8/3/2019 2
Today I want you to help 
me make a graph. 
I want to make a graph that shows 
the change in temperature 
throughout the day yesterday.
What kind of graphs could we 
make to show this?
8/3/2019 3
Bar Graph vs Line Graph
? What is the difference 
between a bar graph 
and a line graph?
8/3/2019 4
Line Graph
?A line graph is a graph used to 
show change over time!!
What can time be measured in???
Seconds - Minutes - Hours – Days -
Weeks - Months – Years - Decades -
Centuries - etc.
8/3/2019 5
When to use a line graph?
Would we use a line graph 
in the following situations:
•To show how many people like pizza in 
this class? NO
•To show how many people live in East 
Meadow? NO
•To show how much it rained each month 
this year? YES- because months and years deal with time.
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FAQs on Introduction to Graphs Class 8 PPT

1. What is a graph in the context of computer science?
Ans. In computer science, a graph is a data structure that consists of a set of vertices (nodes) and a set of edges (connections) between those vertices. It is used to represent relationships or connections between different entities.
2. What are the different types of graphs?
Ans. There are several types of graphs, including directed graphs, undirected graphs, weighted graphs, unweighted graphs, cyclic graphs, acyclic graphs, and bipartite graphs. Each type has its own characteristics and is used for specific purposes in various applications.
3. How are graphs represented and stored in computer memory?
Ans. Graphs can be represented and stored in computer memory using different data structures such as adjacency matrix and adjacency list. An adjacency matrix is a two-dimensional array where each cell represents the connection between two vertices. An adjacency list is a collection of linked lists or arrays where each element contains the adjacent vertices of a particular vertex.
4. What are the common operations performed on graphs?
Ans. Some common operations performed on graphs include adding or removing vertices and edges, finding the shortest path between two vertices, checking if a graph is connected or disconnected, and performing graph traversal algorithms such as depth-first search (DFS) and breadth-first search (BFS).
5. How are graphs used in real-world applications?
Ans. Graphs have various real-world applications, such as social networks, transportation networks, recommendation systems, web page ranking algorithms (like Google's PageRank), network routing, and scheduling problems. Graph algorithms and data structures play a crucial role in solving these problems efficiently.
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