Finding the area of a circle involves following a precise mathematical formula of "Area = 3.14 multiplied by the Radius squared." Using this formula in the form of a flowchart allows a user to follow predefined steps in the calculation in a visually appealing format. Flowcharts use shapes such as circles, diamonds, rectangles and directional arrows to guide a reader through a process. Making a flowchart out of the mathematical formula for finding the area of a circle can be done by hand or by using a specialised flowchart software.

- Skill level:
- Moderate

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### Things you need

- Paper
- Pencil
- Flowchart software (optional)
- Calculator (optional)

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## Instructions

- 1
Lay out a fresh sheet of paper or open your chosen flowchart software to a new file. Title the document "Area of a Circle Flowchart," at the top-centre of the document.

- 2
Draw or click and drag a small oval shape to the top of the page directly below the title. Write the word "Start" inside the oval. Draw or insert a downward directional arrow, approximately 1 inch in length from the bottom of your "Start" oval.

- 3
Draw or add a rectangle shape just below that first downward directional arrow. Write inside the rectangle, "Measure the radius," without the quotation marks. Draw another directional arrow down about 1 inch from the bottom of the rectangle.

- 4
Add another rectangle. Write inside the second rectangle, "Multiple radius measurement by itself," without the quotation marks. Draw another downward directional arrow along with another rectangle.

- 5
Write inside the third rectangle, "Multiply that answer with 3.14," without the quotation marks. Draw another downward arrow and one last rectangle.

- 6
Inside the last rectangle, write "Result = Area," without the quotation marks. Insert one final downward directional arrow and draw or insert another oval shape.

- 7
Write inside the oval shape, "End" without the quotation marks.

#### Tips and warnings

- Feel free to adjust the wording inside the shapes to better suit your needs or your audience. For example, "Multiply answer with 3.14," could be turned into "Answer x Pi (3.14)." Other variations exist. There is no wrong way of wording it as long as you follow the steps in the mathematical formula correctly.
- This mathematical formula works only on the shape of a circle and not for any other shapes, including rectangles or triangles. If you are using a flowchart software, save your work when you finish. Work your way through your newly made flowchart with one or more circles to test it making sure you illustrated the logic correctly.