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 units/ एकक

B

`sqrt 15/2` a units/ एकक

C

`sqrt17`a units/ एकक

D

`sqrt 17/2`a units/ एकक

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