Of course the length is greater than the height. Take the example of a right angled triangle where the hypotenuse is always greater than the other two arms.
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De is the length of the plane. Dr is the height of the plane. So it is impossible to make the length of the plane smaller than the height of the plane. This is why De is always greater than Dr.
The slope of an inclined plane is found by dividing the rise of the plane by the run of the plane. also the ideal mechanical advantage.
length of slope/ height of slope
Lesser the height of inclined plane, and more the length of it, More will be the mechanical advantage of inclined plane i.e less effort would be applied.
Ideal Mechanical Advantage for an Inclined Plane is equal to the length of the incline divided by the height of the incline.