Final answer:
The area of a square rally poster is calculated by squaring the length of one of its sides (Area = a²). If the side length is provided in feet, the area will be in square feet, helpful for calculating how much glitter is needed to cover the poster.
Step-by-step explanation:
The question appears to ask for the area of a rally poster that is shaped like a square. To calculate the area of a square, you would use the formula Area = a², where a is the length of one side. Therefore, if the student provides the measurement of one side of the square poster, the area can easily be calculated by squaring that measurement. If the measurements are given in feet, the result will be in square feet, which is helpful if one needs to know how many tubes of glitter are required to cover the poster, given the coverage area provided by each tube of glitter.
For example, if the side length of the poster is 3 feet, then the area would be 3 feet × 3 feet = 9 square feet. It's important to remember that when dealing with areas, the units will always be squared, as they represent a two-dimensional space. Thus, a square with a side length of twice another will have an area four times greater, because (2a)² = 4a².