Conclusion- A Normal plane is a palne containing the normal vector of surface at a particular point. A Inclined plane is a plane inclined at an angle to the horizontal. A Oblique plane is a plane surface is inclined to one of the principal plane and a side or a diogonal or diameter of a plane surface is parallel to that principal plane and inclined to other plane surface will be calkled oblique plane. Do upvote and comment for more clarification.