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The chord of an arc of a circle is of le...

The chord of an arc of a circle is of length x, the height of the arc is y and the radius of the circle is z. Which one of the following is correct?

A

`y(2z-y)=x^(2)`

B

`y(2z-y)=4x^(2)`

C

`2y(2z-y) =x^(2)`

D

`4y(2z-y) =x^(2)`

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