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If vec a,vec b,vec c are three vectors s...

If `vec a,vec b,vec c` are three vectors such that `vec a=vec b+vec c` and the angle between `vec b and vec c` is `pi/2,` then

A

`a^(2)=b^(2)+c^(2)`

B

`b^(2)=a^(2)+c^(2)`

C

`c^(2)=a^(2)+b^(2)`

D

`2a^(2)-b^(2)=c^(2)`

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The correct Answer is:
A
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