The common chord of the circles $${x^2} + {y^2} - 4x - 4y = 0$$ and $$2{x^2} + 2{y^2} = 32$$ subtends at the origin an angle equal to
- A$${\pi \over 3}$$
- B$${\pi \over 4}$$
- C$${\pi \over 6}$$
- D$${\pi \over 2}$$
✓ Correct answer: D
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