![]() ![]() And, more generally, the area of any rectangle can be found by multiplying length times width. You can count the squares individually, but it is much easier to multiply 3 times 5 to find the number more quickly. The formulas you are going to look at are all developed from the understanding that you are counting the number of square units inside the polygon. These formulas help you find the measurement more quickly than by simply counting. To help you find the area of the many different categories of polygons, mathematicians have developed formulas. Finally, use Side 1 and Side 2 to find the perimeter, i.e., P2× (a+b). For example, P 2 (14 + 8) 2 (22) 44 centimeter (17.3 in). You can use the following points to find the perimeter of a rectangle given area: You need to know at least one side of the rectangle: call it Side 1 Now use the area equation, i.e., ASide 1 × Side 2 to find the unknown side Side 2 and. Both lengths of the rectangle are the same, and both widths are the same. You can write “in 2” for square inches and “ft 2” for square feet. You are able to find the perimeter of the rectangle by adding length and width and multiplying by two because the opposite sides of a rectangle are equal in length. 4 to get 16 squares! And this can be generalized to a formula for finding the area of a square with any length, s: Area = s.Substituting these values into the formula. Solution: The formula to calculate the perimeter is P 2 (length + width) Given that, the length is 40 meters and the width is 3 meters. x is in this case the length of the rectangle while y is the width of the rectangle. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. Since there are 4 rows of 4 squares, you can multiply 4 Example 3: If the length of a rectangle is 40 meters and its width is 3 meters, then find its perimeter using the properties of a rectangle. The perimeter is the length of the outline of a shape. Counting out 16 squares doesn’t take too long, but what about finding the area if this is a larger square or the units are smaller? It could take a long time to count.įortunately, you can use multiplication. You can count that there are 16 squares, so the area is 16 square units. When finding the area of a polygon, you count how many squares of a certain size will cover the region inside the polygon. Examples of square units of measure are square inches, square centimeters, or square miles. As usual, the perimeter is a sum of all sides of a shape: P a + b + a + b. For some geometric shapes, you can find perimeter from the area. ![]() You measure area in square units of a fixed size. Lets find out how to find a perimeter of a rectangle. The area of a two-dimensional figure describes the amount of surface the shape covers. In order to find the perimeter, or distance around the rectangle, we need to add up all four side lengths. ![]()
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