- 18 cm
- 13.5 cm
- 14 cm
- 19.5 cm

Option 4 : 19.5 cm

**Given **

AD = 8.4 cm

BD = 4.8 cm

**Concept used **

AD^{2} = BD × BC

**Calculation **

We know that,

AD2 = BD × CD

⇒ 8.4 × 8.4 = 4.8 × CD

⇒ CD = 14.7 cm

So BC = 14.7 + 4.8 = 19.5 cm

**∴ The required answer is 19.5 cm **

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