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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