Tolong dijawab secepatnya

BC = 13 cm
BD = 4 cm
CD = (13 - 4) cm = 9 cm

AD² = BD x CD
AD² = 4 x 9
AD² = 36
AD = √36
AD = 6 cm

AD²
= CD × BD
= (13-4) × 4
= 9 × 4
= 36

AD
= √36
= 6 cm