**Importance**

3 Dimensional geomerty is just an extension of cartesian geometry in an extra dimension which makes it extremely interesting.

**Yearly trend**
The graph shows conveys that for JEE Advanced there had been a kind of alternating trend, where in if questions are asked upto 3 questions are asked otherwise questions are not asked. JEE Mains has a more steady trend, you get nearly 2 questions definitely from this chapter.

**Important topics**
A point in 3-d is represented as (x,y,z), where x,y,z are distances from yz,xz and xy plane respectively.

Questions from this chapter are around the distance between 2 planes, the distance of a point from a plane. It is also important to look at the conditions for interstection of line-line, plane-plane.