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Verified answer
Bab VektorMatematika SMA Kelas X
AC = C - A
= (0, 0, 8) - (4, 0, 0)
= (-4, 0, 8)
AB = B - A
= (0, -4, 0) - (4, 0, 0)
= (-4, -4, 0)
|AB| = √((-4)² + (4²) + 0²)
= √(16 + 16)
= √32
= 4√2
panjang vektor proyeksi AC ke AB = (AC . AB)/|AB|
= ((-4, 0, 8) . (-4, -4, 0))/4√2
= (16 + 0 + 0)/4√2
= 4/√2
= 2√2