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Three horses are tethered with 7 metre l...

Three horses are tethered with 7 metre long ropes at the three corners at a triangle field having sides 20m, 34m and 42m. The area of the plot which can be grazed by horses is :

A

`50m^2`

B

`77m^2`

C

`82m^2`

D

`90m^2`

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