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If an isosceles triangle the length of e...

If an isosceles triangle the length of each equal side is 'a' units and that of the third side is 'b' units, then its area will be :

A

`(a)/(2)sqrt(2a^(2)-b^(2))" units"^(2)`

B

`(b)/(2)sqrt(a^(2)-2b^(2))" units"^(2)`

C

`(a)/(4)sqrt(4b^(2)-a^(2))" units"^(2)`

D

`(b)/(4)sqrt(4a^(2)-b^(2))" units"^(2)`

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