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The acute angle between the planes P 1 and P 2, when P 1 and P 2 are the planes passing through the intersection of the planes 5 x + 8 y + 13 z – 29 = 0 and 8 x – 7 y + z – 20 = 0 and the points (2, 1, 3) and (0, 1, 2), respectively, is

1. 3 π
2. 4 π
3. 6 π
4. 12 π

Correct answer: 3 π

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