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The sides of a triangle are 7\ c m ,\ ...

The sides of a triangle are `7\ c m ,\ 9\ c m\ a n d\ 14\ c mdot` Its area is
(a)`12sqrt(5)\ c m^2`
(b) `12sqrt(3)\ c m^2`
(c)`24sqrt(5)\ c m^2`
(d) `63\ c m^2`

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