Let \( \alpha \) chord of a circle be that chord of the circle whic...

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Let \( \alpha \) chord of a circle be that chord of the circle which subtends
\( \mathrm{P} \) an angle \( \alpha \) at the center.

W
If \( x+y=1 \) is a chord of \( x^{2}+y^{2}=1 \), then \( \alpha \) is equal to
(1) \( \pi / 4 \)
(2) \( \pi / 2 \)
(3) \( \pi / 6 \)
(4) \( x+y=1 \) is not a chord
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