Diection cosines of line ab where a(-4,9,6) and b (-1,6,6)
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Answer: 1/√2, -1/√2, 0
Step-by-step explanation:
D.R's of line = -1-(-4), 6-9, 6-6
= 3, -3, 0
D.C's of line = D.R÷ magnitude
= 3÷(√(3)^2+(-3)^2+0) ,
-3÷(√(3)^2+(-3)^2+0) , 0
= 3÷√18, -3÷√18, 0
D.C's of line = 1/√2, -1/√2, 0
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