Open the Model sketch and save it as revolved according to the naming convention. If you did not create sketch previously, create a new model and save it as revolved according to the naming convention. In this, create a sketch containing a L with 100mm height, 45mm width and 20mm wide.
Choose Revolve 
. The window Revolve pops up, in which you can customize the feature. (figure "Revolve")
Firstly, highlight the sketch, then click 
and select the long vertical side of your sketch. Subsequently, a preview of the body will be rendered. Additionally you can define the angle after which the rotations stops.
Confirm by clicking OK. (figure "rotated L-Profile")