ত্রিমাত্রিক স্থানাঙ্ক জ্যামিতি: সরলরেখা ও সমতল
Direction cosines and direction ratios of a line, equation of a line in vector and Cartesian forms, angle between two lines, skew lines and shortest distance, equation of a plane in vector and Cartesian forms, angle between planes, line and plane, and distance of a point from a plane.
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