Question
Find the angle between the two planes
3 x – 6 y + 2 z = 7 and 2 x + 2 y – 2 z = 5.
Solution
The equations of given planes are
3 x – 6 + 2 z = 7
and 2 x + 2 y – 2 z = 5
∴ a1 = 3, b1 = – 6, c1 = 2
and a2 = 2, b2 = 2, c2 = – 2
Now,
