You can use a file setup template for letterheads. This will be your guide when you are working on your letterhead design. You may want to check on the link that I've provided. You can find free downloadable templates there. Hope this helps.
Portrait/Landscape
portrait is taller than it is widelandscape is wider than it is tall
Portrait is a rectangle that is shorter on the top and bottom and longer on the sides, (like a portrait) and landscape is longer on the top and bottom and shorter on the sides like you would paint a picture of a landscape.
Portrait Orientation
In Excel you can choose landscape or portrait from the print menu, the default is normally portrait.
No. Portrait is the default page orientation in Excel.
Landscape Orientation
portrait is taller than it is widelandscape is wider than it is tall
You can set your defaults to specify either a portrait or landscape orientation for slides in a new presentation.
Portrait has the long edge running vertically, while landscape has it running horizontally.
It is in landscape orientation.
False. They are in Landscape orientation by default.