Design and implement program that implements the following 3 methods: - Method isValid(...) returns true if the sum of the width and height is greater than 30 boolean isValid (double width, double height){} - Method Area ( ...) returns the area of the rectangle if it is a valid rectangle double Area (double width, double height){} - Method Perimeter(...) returns the perimeter of the rectangle if it is a valid rectangle double Perimeter (double width, double height) { }

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Q: riting a functi

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A: Here is the c++ code of above problem. See below steps for code.

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A: Q: Code the given problem

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Q: Distinguish between a call by value and a call by reference.

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A: Kindly Note: As per our guidelines we are supposed to answer only first question. Kindly repost…

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