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A parallelogram is fromed withveca and ...

A parallelogram is fromed with`veca` and `vecb` as the sides let `vecd_(1)` and `vecd_(2)` be the diagonals of the parallelogram , them `a^(2) +b^(2)=`

A

`((d_(1)^(2)-d_(2)^(2)))/(2)`

B

`((d_(1)^(2)+d_(2)^(2)))/(2)`

C

`(d_(1)^(2)+d_(2)^(2))`

D

`(d_(1)^(2)-d_(2)^(2))`

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The correct Answer is:
B
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