2. Use the polygon option & set the sides to 8 & check off the define slopes option.Draw the octagon of required size.
3. Zoom in to one of the corner of the octagon & create a offset as shown & assign define slope to the two offset lines(select the lines—check on the define slope option).Repeat this to all the other corners & finish the roof.(click on the check sign under Mode panel)
- Use trim to trim off extra lines
- The offset lines should be as small as possible in length.
Watch the finished roof take shape like this