The area of an isosceles trapezium is 17...

The area of an isosceles trapezium is 176 `cm^(2)` and the height is `(2)/(11)` of the sum of its parallel sides. If the ratio of the length of the parallel sides be `4 : 7` , then the length of a diagonal is :

A

`sqrt(168)`

B

`2sqrt(147)`

C

`sqrt(137)`

D

`2sqrt(137)`

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