Write C++ program that defines the named constant PI=2.1419; which stores the value of p. The program should use PI and the library functions pow and sqrt:

a) Output the

b) Prompt the user to input the value of a double variable r, which stores the radius of sphere. The program then outputs the following:

(i) The valu of 4r^{2, which is the surface area of the sphere}

(ii) The value of (4/3)r³ , which is the volume of the sphere

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