Final answer:
For letter addressing in small or large envelopes, start the top margin measurement about 4 inches from the top of the page on standard paper, use block formatting with left justification, and employ a business font like Times New Roman size 12.
Step-by-step explanation:
When addressing letters that will be placed in either small or large envelopes, proper formatting is key to a professional appearance. For both envelope sizes, the top margin measurement for the letter address should typically start about 4 inches from the top of the page on standard 8 1/2 x 11" white paper.
The text should be single spaced, using a legible business font such as Times New Roman size 12, and should follow block formatting with all elements left-justified, including the return address, date, inside address, greeting, body, closing, signature, and typed name.
Everything should be single spaced, with double spacing between paragraphs, and no paragraph indents. These guidelines ensure that your letter meets the formatting requirements expected in a professional setting.