MATHEMATICS GRADE 9 - The Cape Academy of Maths, Science ...

MATHEMATICS GRADE 9

DATE: ..............................................

TOPIC: GEOMETRY OF STRAIGHT LINES

CONCEPTS & SKILLS TO BE ACHIEVED: By the end of the lesson learners should know and be able to write clear descriptions of the

relationship between angles formed:

Parallel lines cut by transversal

RESOURCES: ONLINE RESOURCES

DBE Workbook 1, Sasol-Inzalo book, Textbooks,

Grade 9 GEOMETRY OF STRAIGHT LINES:

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DAY 1: ACTIVITY 1

Teacher instructs learner: Warm Up (10 mins)

Why Warm Up before the start of a lesson?

(Additional information for student and teacher)

Use prior-knowledge activities to help connect to the why of the lesson, paint a picture of where students are headed in the lesson, and develop student perseverance during the lesson (by reminding them throughout the lesson how chosen activities connect to the learning outcomes).

a) Give an example of a pair of vertically opposite angles (draw) and describe how to find the value of one angle when the other is given.

Example

Description

b) Give an example of adjacent supplementary angle pair and describe how to find the value of one angle when the other is given.

Example

Description

Grade 9 GEOMETRY OF STRAIGHT LINES:

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DAY 1 ACTIVITY 1 & 2

LESSON PRESENTATION/DEVELOPMENT (Suggested time: 20 minutes)

INTRODUCTION: GRADE 8 REVISION

STUDY THE FOLLOWING CONCEPTS TO FAMILIARISE YOURSELF WITH SOME FUNDAMENTALS:

What are Parallel Lines? Two lines are parallel to each other if they are the same distance apart on each point and never intersect each other.

Symbol () Parallel lines are indicated by using arrows on the lines. Example:

Parallel lines in our daily life

1 2

Transversal: How do we define a transversal? A transversal is a line that cuts or intersects 2 or more lines. The lines can be parallel or non ? parallel.

Example:

Transversal lines in our daily life:

Grade 9 GEOMETRY OF STRAIGHT LINES:

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CONSOLIDATION/CONCLUSION Activity 2: Copy and complete in your workbook.

Definition

Characteristics

Example (draw)

Parallel lines

Definition Example(draw)

Characteristics

Transversal line

Memorandum: Day 1: Activity 1 & 2 Activity 1 a)

Example

Description AB and CD intersect at O, then O1 = 2 and O3 = 4

Grade 9 GEOMETRY OF STRAIGHT LINES:

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b) Example

Description

If ABC is a straight line, then B^ 1 B^ 2 180

Activity 2

Definition

Characteristics

Two lines are parallel to each other if they are the same distant apart on each point and never intersect each other.

Same distance apart Never intersects Moves in same direction Indicates with arrows Symbol ()

Example

Parallel lines

Definition

Characteristics

A transversal is a line that cuts Straight line

or intersects 2 or more lines.

Creates 8 angles when it cut/

The lines can be parallel or non

intersects pair of lines

? parallel.

Example

Transversal line

Grade 9 GEOMETRY OF STRAIGHT LINES:

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