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Using C++

Need help making sure each function protects itself if precondition is violated

Write a C++ program that will calculate and display the areas of some standard geometric figures. Specifically, the program needs to display the areas of the following geometric figures for length each geometric figure. Each total results). to "protect to have a separate area function for of side l 2, 3, 4, 5, and 6 function needs You need itse from violation of its precondition a. equilateral triangle b. square C. regular pentagon d. regular hexagon e. regular heptagon f. regular octagon