Write program: prompt user to enter 2 double numbers which are the radius of 2 circles. Save values in variables rl and r2 respectively. Calculate: (1) the total area of these 2 circles. Display message “the total area of these two circles is [total-area-of-circles]" (2) the total circumference. Display message “the total circumference is [total- circumference]" Replace [total-area-of-circles] & [total-circumference] with real numbers. For example, display message: “the total area of these two circles is 123.456*.)

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.