Tolong yaa kak bantuannya

Mapel : Matematika
Bab : Kesebangunan dan Kekongruenan

Diketahui :
- CD = 12 cm
- BD = 18 cm

Ditanya :
- AC (y) = ......?

Penyelesaian :
- AD :
CD² = BD × AD
12² = 18 × AD
144 = 18AD
AD = 144 ÷ 18
AD = 8 cm

- AB :
AB = AD + BD
AB = 8 cm + 18 cm
AB = 26 cm

- AC (y) :
AC² = AD × AB
AC² = 8 × 26
AC² = 208
AC = √208
AC = √(16 × 13)
AC = 4√13 cm
y = 4√13 cm

Jawaban : C. 4√13 cm

Maaf Kalau Salah