Delta ABC is an isosceles triangle and b...

`Delta ABC` is an isosceles triangle and `bar(AB) = bar(AC) = 2a `unit, `bar(BC)` = a unit. Draw `AD_|_BC`, and find the length of `bar(AD)` .

A

`sqrt(15)` a unit

B

`sqrt((15)/(2))` a unit

C

`sqrt(17)` a unit

D

`sqrt((17)/(2))` a unit

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The correct Answer is:

B

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