Mathematics - 3D Coordinate Geometry Question with Solution | TestHub
Mathematics3D Coordinate GeometryCoordinates of a point in space, Direction cosines,Medium2 minQB
MathematicsMediumsingle choice
A rectangle ABCD of dimensions r and 2r is folded along the diagonal BD such that planes ABD and CBD are perpendicular to each other. Let the position of the vertex A remain unchanged and is the new position of C. If , then is equal to
Options:
Answer:
B
Solution:
Direction ratios of are , i.e. direction cosines (note ). BA is along the y-axis, so .
Stream:JEESubject:MathematicsTopic:3D Coordinate GeometrySubtopic:Coordinates of a point in space, Direction cosines,
⏱ 2mℹ️ Source: QB
Doubts & Discussion
Loading discussions...
