45 45 90 Right Triangle Worksheet. A worksheet, in the word’s original meaning, is a sheet of paper on which one performs work. It’s a printed page that a child finishes using a writing tool. No additional materials are needed. It is”a sheet of paper where workouts, working time, special instructions, etc. are listed. A bit or scrap of paper on which problems, thoughts, or the like, are put down in tentative form.” In schooling, a worksheet may have questions for students and areas to document answers. In accounting, a worksheet is, or has been, a sheet of paper with columns and rows on which an accountant may record information or perform calculations.