find the area of triangle with given tw...

find the area of triangle with given two sides 18cm and 10cm respectively and the perimeter of the triangle is 42cm is:

A

`20sqrt11 cm^2`

B

`19sqrt11 cm^2`

C

`22sqrt11 cm^2`

D

`21sqrt11 cm^2`

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The correct Answer is:

D

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