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Find the angle between the following pairs of lines.(x)/2=(y)/2=(z)/1and (x-5)/4=(y-2)/1=(z-3)/8

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Answer :Here, a_1, b_1, c_1 are 2, 2, 1 and a_2, b_2, c_2 are 4, 1, 8 respectively
`therefore COSTHETA = (8+2+8)/(sqrt(4+4+1)sqrt(16+1+64)) = (18)/(3xx9) = 2/3 rArr theta = cos^(-) (2/3)`


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