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All the four sides of a parallelogram ar...

All the four sides of a parallelogram are of equal length. The diagonals are in the ratio 1:2. If the sum of the lengths of the diagonals is 12 cm, then what is the area of the parallelogram?

A

`9 cm^2`

B

`12 cm^2`

C

`16 cm^2`

D

`25 cm^2`

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