Step 1) create a 5 sided

Step 2)  Create a line for the revolve

Step 3)   Make that line parallel to the line of the polygon  using the parallel constraint

Step 4) Revolve the polygon over the line:

Step 5) That is a sideways look at the front. Change the 3-d angle and you can see this :

Step 5)  Create a rectangle and dimension it to 20×30 and use an extrude on it.

Screenshot and submit to google