ΔABC be a right-angled triangle where ∠A = 90° and AD ⊥ B

• ক 18 cm
• খ 12 cm ✅ সঠিক উত্তর
• গ If ar (ΔABC) = 40 cm2, ar (ΔACD) = 10 cm2 and AC = 9 cm, then the length of BC is
• ঘ 4 cm