show that a line can be found perpendicular to the three lines with direction cosines proportional to (2,1,5),(4,-2,2),(-6,4,-1). hence , show that if these three lines be concurrent, they are also coplanar

SYED MUSTAFA Hussain's image
SYED MUSTAFA Hussain
Sept. 22, 2018, 12:41 p.m.