Two chords of length 'a' meter and 'b' m...

Two chords of length 'a' meter and 'b' meter make an angle of `60^(@) and 90^(@)` at the centre of circle. Which of the following option are correct-

A

`b=sqrt2 a`

B

`a=sqrt2 b`

C

a= 2b

D

b=2a

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