Tam giác ABC có CD là tia phân giác của góc C

Suy ra, AD/DB = AC/BC ( t/c đường phân giác của tam giác )

AD/DB =12/6 = 2. Suy ra, AD = 2DB

Vì D nằm trên canh AB nên:

AD+BD=AB=12

Thay AD=2DB vào phương trình:

2DB+DB=12

3DB=12

DB=12:3

DB=4 (cm)

Suy ra, AD=2*4=8 (cm)

Vậy AD=8 cm, DB=4 cm.

My family has several cherished traditions during the New Year (Tết) holiday. One of the most important customs is the ancestor worship on New Year's Eve, where we report the family's merits from the past year and show respect. This is followed by a special reunion meal, considered the soul of unity and love, strengthening bonds among generations. On New Year's Day, family members exchange wishes for health and happiness, and children receive "lucky money" in red envelopes. These traditions bring us closer and help preserve our cultural identity.

As an eighth grader, I often feel stress from two main sources. Primarily, it's the schoolwork pressure, especially when I have too many demanding assignments, projects, and difficult exams happening simultaneously. It feels hard to keep everything balanced. I also worry about my social life and making sure I'm accepted by my friends. To manage this, I consciously try to relax by setting aside time to listen to music or play a computer game. I know exercise helps, so I walk in the park or play badminton. Most importantly, I always talk to my older sister or a family member, as sharing problems really helps me feel supported.