jee_main_2026_23_january_morning - Three Dimensional Geometry Topics

Master these core formulas and structures to solve almost any past paper question.

Sample Questions in this Chapter

QUESTION #15 Lines in 3D
The vertices B and C of a triangle ABC lie on the line (x)/(1) = (1 - y)/(-2) = (z - 2)/(3). The coordinates of A and B are (1, 6, 3) and (4, 9, α) respectively and C is at a distance of 10 units from B. The area (in sq. units) of Δ ABC is:
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QUESTION #20 Direction Cosines
Let the direction cosines of two lines satisfy the equations: 4 + m - n = 0 and 2mn + 10n + 3 m = 0. Then the cosine of the acute angle between these lines is:
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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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