Câu 1: Cho tam giác ABC có AB = 15cm, AC = 9cm, BC = 12cm.

a) Chứng minh tam giác ABC là tam giác vuông.

b) Trên tia đối tia CA lấy điểm D sao cho AD = 14cm. Tính độ dài đoạn thẳng BD .

Câu 2: Cho tam giác ABC cân tại A có góc B   50 . Tính góc A.

Rewrite each of these sentences so that the meaning stays the same

1/ I received an email from my uncle last week

->My uncle

2/ My tooth hurts

->I have a

3/ She likes History

->Her

4/ Do you want to come?

->Would

5/ Let's go to the cafeteria

->What about

6/ It took me two hours to do my homework last night

->I spend

7/ The garden is lovely

->What

8/ Mai drinks more water than her sister

->Mai's sister

9/ What's the matter with you?

->What's

10/ He intends to visit his parents tonight

->He is