Final answer:
To determine the length diagonally across the screen, use the Pythagorean theorem. To find the area of the screen, multiply the length and width together.
Step-by-step explanation:
To determine the length diagonally across the screen, we can use the Pythagorean theorem. If the length and width of the screen are given, we can calculate the diagonal using the formula

To calculate the area of the screen, we multiply the length and width of the screen together.
For example, if the length is 10 meters and the width is 5 meters, the area would be area = length * width = 10 * 5 = 50 square meters.