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In a triangle ABC, angle BAC= 90^@ and A...

In a `triangle ABC`, `angle BAC= 90^@` and AD is perpendicular to BC where D is a point on BC. If BD = 4 cm and CD = 5cm then the length of AD is equal to:
`triangle ABC` में, `angle BAC= 90^@` और AD, BC पर लंबवत है जहाँ D, BC पर एक बिंदु है। यदि BD =4 सेमी और CD =5 सेमी तो AD की लंबाई ज्ञात करे

A

6

B

4.5

C

`2 sqrt5`

D

`5 sqrt2`

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