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Find the vlaue of cos B for the triangle...

Find the vlaue of cos B for the triangle formed by joining the points A (6,11 , 2 ) , B (1 , - 1 , 2) and C (1 , 2 , 6 ) .

Text Solution

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The correct Answer is:
`:. cos B = (5 xx 0 + 12 xx 3 + 0 xx 4 )/(sqrt(5^(2) + 12^(2) + 0^(2))sqrt(0^(2) + 3^(2) + 4^(2)))= (36)/(13 xx 5 ) = (36)/(65) `
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