The normal force on a object is always perpendicular (at a right angle) to the surface the object is on.
On a flat surface, the normal force of an object is (the object's weight, that is its mass multiplied by the force of gravity).
On an inclined plane, the normal force is reduced by the angle, and the normal force is .
Note that on a flat surface, (angle)would be 0, and so would be 1. Thus, the two equations are equal.