6. define a C++ class having the following members: (1) 2instance methods the prototype of the first method is doublefunA(int r). The parameter r represents the radius of a circle. ThefunA will calculate the area of a circle and the value of itsradius is from the parameter r. It will return the area of thecircle. the prototype of the second method is double funB(int w,int h). The parameters w and h represent the width and height of arectangle. The funB will calculate the area of the rectangle andreturn the area of the rectangle. (2) 1 static method
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