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If two lines L1 and L2 with direction ratios \(a_1,b_1,c_1 \,and \,a_2,b_2,c_2\) respectively are perpendicular to each other then\(a_1 a_2+b_1 b_2+c_1 c_2=0\)

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If two lines L<sub>1</sub> and L<sub>2</sub> with direction ratios \(a_1,b_1,c_1 \,and \,a_2,b_2,c_2\) respectively are perpendicular to each other then<br />\(a_1 a_2+b_1 b_2+c_1 c_2=0\)






 
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