What is the area of a L of a cardboard carton?

To calculate the area of an "L" shape of a cardboard carton, you need to break the shape into its rectangular components. Measure the dimensions of each rectangle and use the formula for area (length × width) for each part, then sum the areas together. If the "L" consists of two rectangles, for example, you would calculate the area of each rectangle separately and add them to find the total area.