a) bằng nhau

b) vuông góc

a) bằng nhau

b) song song với nhau

Giả thiết : Một đường thẳng vuông góc với một trong hai đường thẳng song song

Kết luận : nó cũng vuông góc với đường thẳng còn lại

☠☢

1. She is painting.

2. It's playing football .

3. She has a teddy bear, two cars and a bus.

4. He has a plane.

5. I can see a rabbit.

6. It's counting.

1. My name is KITTY.

2. I'm eight years old.

3. I like dancing.

4. I play football.

1. My name is KITTY.

2. I'm eight years old.

3. I like dancing.

4. I play football.

1. She is twenty.

2. No, I don't.

3. I have no dogs

4. I'm drawing.

1. He's playing basketball.

2. It's climbing.

3. I can see a peacock.

4. He has two ships.