# Find the measure of AD. If BC=14 cm and BD=5 cm.

∠A of ΔABC is a right angle. AD is perpendicular on BC. If BC=14 cm and BD=5 cm, then measure of AD is;

- 3√5 cm
- 3.5√5 cm
- 2√5 cm
- √5 cm

**Answer: (1) 3 sqrt.5 cm**

**Explanation:-**In triangle ABC

As we know that

**square of AD = BD x CD**

Then, Square of AD = 5 x 9

= 45 cm

Therefore, AD = 3 sqrt.5 cm

Hence, the answer is (1) 3 sqrt. 5 cm.