Даны точки:
A (2; -9; 1)
B (-6; 1;- 7)
C (-7; 0; -9)
D (-9; 8; 3)
Найти угол между векторами AB и CD
A (2; -9; 1)
B (-6; 1;- 7)
C (-7; 0; -9)
D (-9; 8; 3)
Найти угол между векторами AB и CD
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Answers & Comments
Verified answer
→ →АВ{-8, 10, -8}, |AB| = √(64 + 100 + 64) = √228= 2√57
→ →
CD{-2, 8, 12}, | CD| = √ (4 + 64 +144)=√212 = 2√53
Cosα = (16 +80 - 96)/(2√57*2√53) = 0
α = 90°