Calculations at a semi-ellipse. What you have is a rectangle and a circle (It's been cut down the middle and the rectangle shoved in it). The perimeter (P) of a rectangle is the sum of the length's of all four sides which can be simplified by using the length (l) and width (w) as follows: P = 2*w+2*l. We have to find the perimeter of the shaded region. The diameter of the semi-circle is 12cm. Learn more... A rectangle is a plane, a quadrilateral that has 4 right angles. Perimeter of a rectangle formula. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. That means that l = 3(1/20 km) = 3/20 km. Therefore, the upper and lower bounds of the perimeter of the rectangle are 427.8 cm and 427.4 cm, respectively.----- Your comments and suggestions are welcome here. Define the width of the rectangle as w and the diameter of the semi circles as d. Then, the perimeter of a circle is Pi * d. the perimeter of the shape is Pi * d + 2w = 40. \[Circumference\, of\, circle=\pi d=\pi\,\times 8=25.12cm\] \[Half\, of\, circumference = 12.56cm\] To find the perimeter of a rectangle, use the formula P = 2 × (l + w). 4.5 6 customer reviews. If it doesn’t form a valid Triangle, then we display that message on to the console window. For example, a rectangle measuring 4 x 6 would have a perimeter of 20, but a rectangle measuring 3 x 8 would have a perimeter of 22. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/1c\/Find-the-Area-and-Perimeter-of-a-Rectangle-Step-1-Version-3.jpg\/v4-460px-Find-the-Area-and-Perimeter-of-a-Rectangle-Step-1-Version-3.jpg","bigUrl":"\/images\/thumb\/1\/1c\/Find-the-Area-and-Perimeter-of-a-Rectangle-Step-1-Version-3.jpg\/aid1954108-v4-728px-Find-the-Area-and-Perimeter-of-a-Rectangle-Step-1-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

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