• identifying and naming perpendicular and parallel lines

What will we learn today?

Geometry Perpendicular and Parallel Lines

We are going to learn about lines today!

Lines are everywhere.

On roads

On shopping items

Perpendicular Lines

Definition:

Lines that are at right angles (90°) to each other.

Perpendicular

It means at right angles (90°) to.

How do we label perpendicular lines?

We can draw a little box in the corner.

The little box drawn in the corner, means "at right angles"

Try this out!

Can you see any right angle(s) in the figure?

Try this out!

Can you see any right angle(s) in the figure?

Try this out!

Can you see any right angle(s) in the figure?

Try this out!

Can you see any right angle(s) in the figure?

Try this out!

Can you see any right angle(s) in the figure?

Try this out!

Can you see any right angle(s) in the figure?

There are 4 right angles in a square.

Applying the concept learnt

Since there are 4 right angles in a square,

we can find perpendicular lines.

Let’s label the square for easy reference.

Remember to label in sequence.

A B

C D

Applying the concept learnt

Line AB is perpendicular to Line BC.

A B

C

Try this out!

Can you find any other pair(s) of perpendicular lines in the figure?

Try this out!

Line BC is perpendicular to Line DC.

A B

C D

Try this out by yourself!

In total, there are 4 pairs of perpendicular lines.

A B

C D

Summary

Perpendicular Lines:

Lines that are at right angles (90°) to each other.

Parallel Lines

Definition:

• Lines are parallel if they are always the same distance apart and will never meet.

• They also point in the same direction.

In conclusion, parallel lines are Always the same distance apart and never touching.

Try this out!

Try this out!

A

B

C

D

E

F

Name the parallel lines.

Try this out!

A

B

C

D

E

F

Line AB is parallel to Line CD.

Try this out!

A

B

C

D

E

F

Line AB // Line CD.

We can use // to represent ‘is parallel to’.

Do you know?

A

B

C

D

E

F

Line EF is not parallel to any of the lines.

Explanation

A

B

E

F

Line EF is not parallel to any of the lines.

1. Always the same

distance apart 2. Never touching.

Parallel Lines

Explanation

C

D

E

F

Line EF is not parallel to any of the lines.

1. Always the same

distance apart 2. Never touching.

Parallel Lines

Try this out!

Can you see any parallel line(s) in the figure?

Try this out!

Can you see any parallel line(s) in the figure?

Let’s label the square for easy reference. Remember to label in sequence.

A B

C D

Try this out!

Can you see any parallel line(s) in the figure?

Line AB // Line DC

A B

C D

Try this out!

Can you see any parallel line(s) in the figure?

Line AD // Line BC

A B

C D

Try this out!

Can you see any parallel line(s) in the figure?

There are 2 pairs of parallel lines.

A B

C D

Are you ready to try out the questions?

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