Final answer:
Side margin measurements for a letter address in a small envelope should follow standard business letter formatting with 1-inch margins, left-justification for the text, and standard business font like Times New Roman size 12.
Step-by-step explanation:
Standard Letter Formatting for Small Envelopes
When addressing a letter for a small envelope, the side margin measurements should ensure sufficient space for the inside address of the recipient as well as the sender's address. Typically, you would use standard business letter formatting, which includes using 8 1/2 x 11" white paper with 1-inch margins.
The text should be left-justified, employing a business-appropriate font such as Times New Roman, with a font size of 12. In addition, ensure to follow the structure which includes the sender's address, date, recipient's inside address, greeting, body of the letter, closing, your signature, and your typed name. The standard practice is to align the addresses and all parts of the letter to the left margin and to maintain consistent spacing throughout your letter.