13 In the following cases, determine whether the given planes are parallel or perpendicular, and in case they are neither, find the angles between them.
(c) 2x – 2y + 4z + 5 = 0 and 3x – 3y + 6z – 1 = 0
whose direction ratios are and whose direction ratios are ,
are said to Parallel:
And the angle between is given by the relation,
So, given two planes
So, applying each condition to check:
Thus, the given planes are parallel as .
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