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The two sides of a triangle are 18 cm an...

The two sides of a triangle are 18 cm and 10 cm. Its perimeter is 42 cm. Area of this triangle is :

A

`21 sqrt11 cm^2`

B

`31 sqrt15 cm^2`

C

`48 sqrt15 cm^2`

D

`56 sqrt15 cm^2`.

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