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2 PA = 3 PB
2(a-p) = 3 (b-p)
p = 3b - 2a
P = ( 9, -14, 18) - ( 6, 2, -8) = (3, -16, 26)
AB= b-a = (0, -5, 10)
P. AB = 0 + 80 +260 = 340
|AB| = √ (25+100) = 5√5
..
Panjang proyeksi OP pada AB =|d| = P. AB/ |AB|
|d| = 340/ (5√5) = 340√5 / (25)= (68/5) √5