In a ΔBAC = 90° and AD is perpendicular to BC where D is a point on BC. If BD = 4 cm and CD = 5 cm, then the length of AD is equal to :
Answer & explanation
Correct answer: option 3
In a ΔBAC = 90°
BD = 4 cm
CD = 5 cm
The value of AD = \(\sqrt {BD × CD}\)
= \(\sqrt {4 × 5}\) = $2\sqrt{5}$ cm