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write a program that reads the three edges of a triangle (a, b, and c) and...

write a program that reads the three edges of a triangle (a, b, and c) and displays the area and perimeter if the input is valid. Otherwise, display that the input is invalid. The input is valid if the sum of every pair of two edges is greater than the remaining edge. Note that area = √s(s-a)(s-b)(s-c), where s = ( a+b+c)/2

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