<b>Narration</b>

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Welcome to the tutorial on <b>Inscribe a Polygon</b>.

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In this tutorial, we will learn to,

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Inscribe a pentagon inside a circle

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<b>Format </b>the object with wireframe or flatlines

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Change color and line width

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Add <b>annotation</b>

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Set global or individual font size

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Measure the length of an edge and

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About <b>View</b> toolbar,

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zoom and reset

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To record this tutorial, I am using<b> Windows</b> 11 <b>OS</b> and <b>FreeCAD</b> version 0.21.1

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To follow this tutorial,

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Learners must be familiar with the <b>FreeCAD</b> interface.

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For pre-requisite tutorials, please visit this site.

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Open <b>FreeCAD</b> and start a new file.

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Select Draft workbench.

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Make sure that <b>Orthographic</b> and top view are selected.

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Let’s add a pentagon to this drawing.

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<b>FreeCAD </b>inscribes a polygon inside of a circle

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Equation for inscribing a pentagon of a circle is <b>R</b> is equal to 0.85 times<b> A</b>.

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Where <b>A </b>is the length of the side of the pentagon.

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And <b>R</b> is the radius of the circle.

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Click on the <b>Polygon</b> tool as seen.

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Notice the <b>Sides</b> option in <b>combo view</b>, <b>Model tab</b>.

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Change it to 5, since a pentagon has 5 sides.

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Move the cursor to the drawing canvas and notice the<b> + crosshair.</b>

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Left click hold and drag to form the desired polygon.

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First only the circle on which the polygon is inscribed is seen.

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Notice the <b>Radius</b> form on the left <b>combo view</b> panel.

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As you drag to form a larger circle, the radius in the form also changes.

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I will keep the radius around 20 <b>mm</b> and click on the canvas.

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This fixes the radius of the circle and the polygon can be seen.

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To select an object click on it and notice the green outline.

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The new object is also added in the <b>combo view</b> as polygon.

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Make sure the polygon is selected in the <b>combo view</b>.

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Place the cursor on the edge of the panel as seen.

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Click and drag to resize the panel.

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Properties of the object can be changed using the <b>Model </b>tab.

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For the first option of the <b>bounding box</b>, choose <b>true</b>.

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Notice that a <b>bounding box </b>for the object is displayed.

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This allows us to encompass the area of selected objects in the canvas.

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We can also toggle this on or off from the view toolbar on the top menu.

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Scroll down to object style.

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Click on the pull down menu for <b>Display mode</b> as seen here.

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<b>Wireframe </b>shows only the edges of the object.

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I will choose <b>Flat lines</b> now.

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This will enable us to draw a color shaded or color filled object.

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Scroll down and click on the form for<b> line color</b>.

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A <b>Select color </b>dialog box appears.

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Some of you will have to click again for the dialog box to open.

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I will choose red and click on <b>OK</b>.

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When the object is selected, the outline is in green color.

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Hence the change will not be visible at this point.

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Scroll down and change the <b>line width</b> to 8.

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Scroll down to the <b>Shape color</b>.

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Click on the form and open the <b>Select color </b>option.

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If the object has multiple faces, we can color the various faces differently.

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I will choose an orange color and click on <b>OK</b>.

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Notice that we can also change the transparency of the object here.

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Now, pause the video, and draw a circle partially overlapping the pentagon.

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Use <b>flat lines</b> for <b>display mode</b> and fill it with a color of your choice.

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Then change the<b> transparency</b> level and notice the changes.

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The color changes will be visible only when the object is not highlighted.

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Next, let’s measure the distance of the side of the pentagon.

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First click to select the edge of your choice.

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Next, click on the <b>Dimension tool</b> in the <b>Draft Annotation tools</b>.

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A line parallel to the selected line appears on the canvas.

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Place it a bit away where you want the annotation to be placed.

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Left click to notice the measured line and annotation.

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For some of you the font size may be very small and not visible.

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We can format the annotation globally or individually.

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In the <b>combo view</b>, <b>model</b> tab, select the <b>dimension</b> label.

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Scroll down to the graphics section and <b>line color</b>.

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Click once or twice depending on your system to open the <b>select color</b> dialog.

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Choose red and click on <b>OK</b>.

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Then, scroll to the text section in the panel below.

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Go to the <b>font size </b>section and change it to 5 mm.

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Now the text size changes.

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To change the default font setting, go to <b>Edit</b>, <b>Preferences</b>.

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Choose the <b>Draft tab</b> on the left.

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Then choose the<b> Text and dimensions</b> on top.

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Set the desired parameters here for global setting.

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The changes will apply only to the annotations that you will add later on.

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For now I will click on <b>Cancel</b> as I do not want to change them.

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Let us measure the distance between two user chosen points.

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First click on the <b>measure distance</b> tool on the <b>View</b> toolbar.

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The report view window prompts the user to pick the first point.

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Click on your desired first point.

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I will choose one of the vertex of the pentagon.

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Then I will click on another vertex.

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Notice the distance between them is now shown on the canvas.

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Delete the measurements using the <b>combo view</b>, <b>model</b> tab.

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Select the object and delete it.

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You may want to readjust the zoom level at any point.

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Use the <b>View</b> toolbar options as seen to fit all objects or the selection.

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Many of these are also available as <b>context menu</b>s.

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Right click on the canvas with the selected object to access them.

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Users must practice to get familiarity with the various tools.

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Save your work if desired.

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Use <b>File</b>, <b>Exit</b> to close <b>FreeCAD</b>.

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Now let's summarize.

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In this tutorial, we,

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Inscribed a pentagon

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Formatted color and line properties

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Added <b>Annotation</b>

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Formatted the text properties

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and Measured distance between two points

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For assignment activity, please do the following.

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Draw a rectangle

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Draw a hexagon with <b>A</b> =25 mm.

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Hint: For hexagon, <b>A</b> = <b>r </b>to inscribe on a circle.

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Practice to draw and format the properties of objects.

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Hint: You may also use the parameters in <b>combo view</b> window to modify.

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This video summarises the Spoken Tutorial Project .

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Please download and watch it.

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Please post your timed queries in this forum.

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