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If the differences of each of the sides...

If the differences of each of the sides of a triangle from its half-perimeter be 8cm, 7 cm, and 5 cm, then the area of the triangle is

A

`20sqrt(7)" sq-cm "`

B

`10sqrt(14)" sq-cm "`

C

`20sqrt(14)" sq-cm "`

D

140 sq-cm

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