![]() These examples illustrate how to calculate the area, perimeter, and diagonal of a rectangle manually, but if you prefer to use the calculator for quicker results or to merely check your work, then feel free to do so. Take the square root of both sides and the diagonal d is approximately 7.2 inches To find the diagonal using the same dimensions: The perimeter is 2 a + 2 b, so in this example the perimeter Using the same dimensions, we can calculate the perimeter. Suppose the length is a = 6 inches and the width is b = 4 inches Perimeter (distance around the outside of the rectangle) = a + a + b + b or 2 a + 2 b and is noted as (P)ĭiagonal is d² = a² + b² which is the Pythagorean Theorem (see our Pythagorean Theorem calculator).Įxample of calculating the area of a rectangle: Here are the basic formulas used by the calculator. The diagonal, which goes from one vertex to the opposite vertex cutting the rectangle into two squares, is called the diagonal and noted as d. The lengths of the sides will be given as a or b or you can use l and w for “length” and “width”. If the lengths of the sides are all the same, then the rectangle is also a square. But you can stick around here and learn more about finding the area of a rectangle.Ī rectangle has four 90 degree angles. If interested in calculators for a variety of other shapes, you can look at more of our handy calculators. If you need to find the area and perimeter of a rectangle, this calculator is the handy tool you will need.īy simply inputting the length and width, this calculator will almost instantly find the perimeter (P) and the area (A). Go back to Calculators page How to Calculate the Area of a Rectangle ![]() Jump to Real-life Applications of these Calculations Jump to Calculating the Diagonal of a Rectangle Jump to Calculating the Perimeter of a Rectangle Knit the five stitches and bind off, and weave in your ends.Jump to Calculating the Area of a Rectangle Work the decrease row on every row until you have five stitches left on the needle. So it’s time to knit the last section, the triangle that will finish everything and make your knitting project look like an actual rectangle. Keep alternating these rows until the long side of your work has the same length as you wish your finished rectangle to have. Every time your row has a marker at the beginning, it’s a decrease row.ĭecrease row: Slip 1 stitch knitwise, knit 2 stitches together, yarn over, knit 2 stitches together, knit until end of the row. This makes it super clear if you’re about to increase or decrease. Place a marker after the slipped stitch the first time you knit the decrease row. In other words, you’re going to alternate the increase row with an decrease row. To form the parallelogram or the body of the rectangle you need to increase on one side and decrease the same amount of stitches on the other side. When increasing on all rows your work will be shaped like a triangle. Repeat row 2 until the sides are as long as you want the shortest side of your rectangle to be. ![]() Increase row: slip 1 knitwise, K1, yarn over, knit to the end of row. You can use your favorite cast on method, I use the long tail cast on as I find it quick and easy to do. Knitting pattern: Corner to corner rectangle Section 1: Cast on and increasesĬast on 5 stitches. Section 3: You decrease on both sides to form the closing triangle and cast off at the corner opposite to where you started. Section 2: You increase on one side and decrease on the other side to form a parallelogram shape. ![]() Section 1: You start at a corner and work increases to form a triangle shape. When you knit a rectangle diagonally the work can be divided into three sections. How to knit a rectangle from corner to corner
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