Algorithm to Find the Area of a Circle

In this tutorial, we will learn how to write and develop an algorithm and flowchart to find the area of a circle of radius r. The problem to solve is to find the area of the circle.

The mathematical formula to compute the area of the circle is:

area = pi*r*r

IPO chart

Let’s analyze the inputs and the expected outputs of the program.

Input, Process, and Output chart.

Input	Process	Output
The radius of the circle(r)	Area = pi * r * r	Area of the circle(Area)

Algorithm

Input: Radius r of the Circle.

Output: Area of the Circle

• Step 1: Start
• Step 2: Read the radius r of the circle
• Step 3: Compute the Area as per the formula.  PI*r*r
• Step 4: Print the area of the circle
• Step 5: Stop

Pseudocode

The pseudocode for the algorithm is as follows:

START
DECLARE Real r
DECLARE Real area

OUTPUT "Enter the circle radius="
INPUT r
ASSIGN area = PI*r*r
OUTPUT "Area of the circle with radius " & r & " = " & area
END

Flowchart

Let’s develop the flowchart for the given problem:

Sample Run

Execute the flowchart and verify its output.

That’s it. We have successfully designed an algorithm & flowchart to compute the area of the given circle.

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Flowgorithm Tutorials

You can find tutorials for the Flowgorithm flowchart tool on this website at:

• https://www.testingdocs.com/flowgorithm-flowchart-tutorial/

Flowgorithm Website

For more information, visit the official website of Flowgorithm.

• http://flowgorithm.org/