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            ______   _____       ___     __   __  
  ____     /_   _// |  __ \\    / _ \\   \ \\/ // 
 |    \\    -| ||-  | |  \ ||  | / \ ||   \   //  
 | [] ||    _| ||_  | |__/ ||  | \_/ ||   / . \\  
 |  __//   /_____// |_____//    \___//   /_//\_\\ 
 |_|`-`    `-----`   -----`     `---`    `-`  --` 
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Text this: A simple design tool for the calculation of effective section area for class 4 open section using MS-excel