Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE MainMathematicsThree Dimensional Geometry

The base BC of a triangle ABC lies on the line L₁: x 2 = y-1 1 = z-2 2 and has a length of 3 2 units. The vertex A lies on the line L₂: x-2 1 = y-2 2 = z-4 -1 . If the area of ABC is 10 sq. units, there are two possible positions for the vertex A , say A₁ and A₂ . The value of OA₁^2 + OA₂^2 , where O is the origin, is _______.

Correct answer

96

Step-by-step solution

Let the height of ABC be h . The area is given by: 1 2 BC h = 10 1 2 3 2 h = 10 h = 20 3 2 h^2 = 400 18 = 200 9 . The vertex A lies on L₂ , so its coordinates can be written parametrically as A(k+2, 2k+2, -k+4) . The line L₁ passes through P₀(0, 1, 2) and has a direction vector b = 2 i + j + 2 k . The magnitude is | b | = 4+1+4 = 3 . The vector P₀A = (k+2 - 0) i + (2k+2 - 1) j + (-k+4 - 2) k = (k+2) i + (2k+1) j + (-k+2) k . The perpendicular distance h from A to L₁ is given by h = | P₀A b | | b | . P₀A b = vmatrix

Practice Three Dimensional Geometry on Quantrex Academy →

More from Three Dimensional Geometry

Let P be the plane such that it contains the straight line x-1 2 = y-3 3 = z+2 1 and is perpendicular to the plane x + 2y + 3z = 4 . Let P₁ be the plane which passes through the po 2026Let L be the straight line joining the points P(1, 2, -1) and Q(2, 3, 1) . Let S be the foot of the perpendicular drawn from the point R(4, -1, 5) to the line L . Another line pass 2026Let the foot of perpendicular from the point ( , 2, 3) on the line x-4 1 = y-9 2 = z-5 1 be the point (1, , 2) . Then the distance between the lines x-1 2 = y-2 3 = z+4 6 and x- 2 2026Let a line L₁ pass through the origin and be perpendicular to the lines L₂: r = (3+t) i + (2t-1) j + (2t+4) k and L₃: r = (3+2s) i + (3+2s) j + (2+s) k , t, s R . If (a, b, c) , a 2026The shortest distance between the lines x-4 1 = y-3 2 = z-2 -3 and x+2 2 = y-6 4 = z-5 -5 is : 2026Let the image of the point P(0, -5, 0) in the line x-1 2 = y 1 = z+1 -2 be the point R and the image of the point Q (0, -1 2 , 0 ) in the line x-1 -1 = y+9 4 = z+1 1 be the point S 2026Let the image of the point P(1, 6, a) in the line L: x 1 = y-1 2 = z-a+1 b , b > 0 , be ( a 3 , 0, a+c ) . If S( , , ) , > 0 , is the point on L such that the distance of S from th 2026Let a line L be perpendicular to both the lines L₁: x+1 3 = y+3 5 = z+5 7 and L₂: x-2 1 = y-4 4 = z-6 7 . If is the acute angle between the lines L and L₃: x - 8 7 2 = y - 4 7 1 = 2026 Full Three Dimensional Geometry list All JEE Main PYQs