रेखा `bar("r") = (2i - j + k) + lamda(-i + j + k)` तथा समतल `bar("r")*(3i + 2j -k)` = 4 के मध्य कोण होगा

Find the distance between the planes bar(r) * ( 2 bar(i) - bar(j) + 3 bar(k)) = 4 and bar(r) * ( 6 bar(i) - 3 bar(j) + 9 bar(k)) + 13 = 0