PPT: Parallel and Intersecting Lines | Mathematics Olympiad Class 7 PDF Download

 Page 1


Parallel and Intersecting Lines
Page 2


Parallel and Intersecting Lines
Introduction to Lines
What We'll Learn
We'll explore how lines relate on flat surfaces 
like paper or blackboards.
Some lines cross each other. Others run 
alongside without touching.
Key Concepts
We'll discover special names for different 
types of lines.
We'll learn about the angles formed when lines 
interact.
Page 3


Parallel and Intersecting Lines
Introduction to Lines
What We'll Learn
We'll explore how lines relate on flat surfaces 
like paper or blackboards.
Some lines cross each other. Others run 
alongside without touching.
Key Concepts
We'll discover special names for different 
types of lines.
We'll learn about the angles formed when lines 
interact.
Across the Line
Paper Folding
Folding a square paper creates lines along 
the creases.
Intersecting Lines
When two lines cross at a single point, they 
intersect.
Point of Intersection
The exact spot where two lines meet is 
called the point of intersection.
Page 4


Parallel and Intersecting Lines
Introduction to Lines
What We'll Learn
We'll explore how lines relate on flat surfaces 
like paper or blackboards.
Some lines cross each other. Others run 
alongside without touching.
Key Concepts
We'll discover special names for different 
types of lines.
We'll learn about the angles formed when lines 
interact.
Across the Line
Paper Folding
Folding a square paper creates lines along 
the creases.
Intersecting Lines
When two lines cross at a single point, they 
intersect.
Point of Intersection
The exact spot where two lines meet is 
called the point of intersection.
Angles at Intersection
Four Angles Form
When two lines 
intersect, they create 
four angles (a, b, c, d).
Straight Line 
Property
Adjacent angles form a 
straight line (180°).
Opposite Angles 
Equal
Angles opposite each 
other are equal (a=c, 
b=d).
Page 5


Parallel and Intersecting Lines
Introduction to Lines
What We'll Learn
We'll explore how lines relate on flat surfaces 
like paper or blackboards.
Some lines cross each other. Others run 
alongside without touching.
Key Concepts
We'll discover special names for different 
types of lines.
We'll learn about the angles formed when lines 
interact.
Across the Line
Paper Folding
Folding a square paper creates lines along 
the creases.
Intersecting Lines
When two lines cross at a single point, they 
intersect.
Point of Intersection
The exact spot where two lines meet is 
called the point of intersection.
Angles at Intersection
Four Angles Form
When two lines 
intersect, they create 
four angles (a, b, c, d).
Straight Line 
Property
Adjacent angles form a 
straight line (180°).
Opposite Angles 
Equal
Angles opposite each 
other are equal (a=c, 
b=d).
Key Angle Concepts
Linear Pair
Adjacent angles that add up to 180°.
They form a straight line together.
Examples: "a and "b, or "b and "c.
Vertically Opposite Angles
Angles opposite each other at intersection.
These angles are always equal.
Examples: "a and "c, or "b and "d.