In Revit, create a new file and save it with the following name:
Draw 2 sets of enclosed walls 10' in height based on the dimensions below. On the square walls, place an extruded roof. On the round walls, place a dome roof. Create new materials for the walls and roofs. Apply these materials (outside only). Take a screen shot of your materials window showing the materials you made. Export a 3D view (taken with a camera) of the outside of the two buildings. Create a new sub page of your 'House' page. Name it: Roof. Place the two exported images and the screenshot on this page.
Here is some more information from Autodesk about creating roofs.