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Slide 1

LINES AND ANGLES

:

AMAN PUNIA

CLASS IX-”A”

ROLL NO -23

Slide 2

Def: line that do not intersect.

Illustration:

Notation: l || m AB || CD

Slide 3

Hardwood Floor

Opposite sides of windows, desks, etc.

Parking slots in parking lot

Parallel Parking

Slide 4

Examples of Parallel Lines

LINE A

LINE B

HERE LINE A and LINE B Are PARALLEL

Slide 5

Def: Lines that intersect to form a right angle.

Illustration:

Notation: m n

Key Fact: 4 right angles are formed.

Slide 6

Ex. of Perpendicular Lines

Window panes : The Window Panes are

PERPENDICULAR to each other

Slide 7

Def: a line that intersects two lines at different points

Illustration:

t

Slide 8

Two angles that are opposite angles.

1

2

3

4

5

6

7

8

t

1 = 4

2 = 3

5 = 8

6 = 7

Slide 9

Vertical Angles

Find the measures of the missing angles

125

?

?

55

t

55

125

Slide 10

Two angles that form a line (sum=180)

5+6=180

6+8=180

8+7=180

7+5=180

1+2=180

2+4=180

4+3=180

3+1=180

Slide 11

Supplementary Angles/ Linear Pair

Find the measures of the missing angles

?

72

?

t

108

108

180 - 72

Slide 12

Two angles that occupy corresponding positions.

Top Left

t

Top Left

Top Right

Top Right

Bottom Right

Bottom Right

Bottom Left

Bottom Left

1 = 5

Go to page:

1 2

1 2

- Parallel lines
- Examples of Parallel Lines
- Perpendicular lines
- Transversal
- Vertical Angles
- Supplementary Angles/ Linear Pair
- Corresponding Angles
- Alternate Interior Angles

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