Final answer:
Myra will use the protractor to accurately measure and sketch angles in her designs for a department store window, which is important for geometric precision in her plans.
Step-by-step explanation:
Myra is likely going to use the protractor to ensure that she has accurate measurements in her designs, specifically when it comes to angles. Protractors are not used for adding color or ensuring pictures are hanging straight. Instead, they are designed to measure angles, which is fundamental in creating accurate geometric designs, such as making sure that specific elements of the window display meet at the correct angles. This task could involve measuring angles for cutting materials, arranging objects at certain angles, or checking the slope of lines in her designs. By using the protractor, Myra can ensure that any angular design elements are correctly depicted in the sketch before execution.