The mechanical advantage of an inclined plane is :

In an inclined plane, the formula for mechanical advantage is the length of the slope divided by the height of the inclined plane. where, Mechanical advantage =  
\(=\frac{\text { slope length }}{\text { height }}\)

Since for a right angle triangle, slope (i.e. hypotenuse ) is always greater than the height (i.e. any side), the mechanical advantage is greater than unity in case of an inclined plane.