How to draw a cylinder using the Ellipse Tool of the Geometry Sketchpad

1. Use the Ellipse tool in the Geometry Sketchpad custom tool to draw an ellipse. Select the points outside the ellipse and press "Ctrl+H" to hide them. Use the point tool to draw a point on the ellipse, labeled F. As shown in Figure 1

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Figure 1

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2. Select point F, click the "Transform"-"Translate" menu command, set the "Fixed Distance" to 6 cm and the angle to 90 degrees in the dialog box, click the "Translate" button, and draw the point F translates point F' by 6 cm. Select point F and point F’, press the shortcut key “Crl+L” to make line segment FF’. As shown in Figure 2

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Figure 2

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3. Select point F and point F’, click the “Construction”-“Trajectory” menu command in sequence to draw the trajectory of point F’. Select point F and line segment FF’ in the same way, click the "Construction" - "Trajectory" menu commands in order to draw the side of the ellipse. As shown in Figure 3

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Figure 3

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4. Select the upper and lower base ellipses, hold down the "Shift" key, click "Display" - "Line Type" menu command, select "Thick Line" in the lower-level menu of the "Line Type" menu, so that both the upper and lower floors are "Thick Line" Wire". In the same way, select "Red" in the lower-level menu of the "Display" - "Color" menu. Select the line segment FF’ and the current endpoint, and press “Ctrl+H” to hide it. As shown in Figure 4

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Figure 4

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