Final Answer:
The length of the rectangle can be found using the formula A = l * w, where A is the area, l is the length, and w is the width. Given that the width is 21 yards and the area is 630 square yards, the length (l) is calculated as l = A / w = 630 / 21 = 30 yards.
Step-by-step explanation:
The formula for the area (A) of a rectangle is given by A = l * w, where l represents the length and w represents the width. To find the length when the width is 21 yards and the area is 630 square yards, we'll use the formula rearranged to solve for length: l = A / w. Substituting the values, we get l = 630 / 21 = 30 yards.
This calculation represents the process of determining the length of the rectangle using the provided width and area. Given that the width is 21 yards and the area is 630 square yards, dividing the area by the width yields the length of the rectangle.
In this case, when the width is known and the area is given, applying the formula allows us to solve for the length, which turns out to be 30 yards. This result provides the necessary information to fully define the rectangle's dimensions based on the given area and width.