Program plan: The variable r of type float is used to accept the value of radius. The variable area of type float is used to calculate the area of circle. Program description: The main purpose of the program is to accept the radius and then calculate and display the area of the circle, using the formula given.

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Chapter 3.4, Problem 3E

Program Plan Intro

Program plan:

The variable r of type float is used to accept the value of radius.

The variable area of type float is used to calculate the area of circle.

Program description:

The main purpose of the program is to accept the radius and then calculate and display the area of the circle, using the formula given.

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