Apps, Geometry, Isosceles

Isosceles Tutorial: Constructing Perpendicular Lines

In Isosceles, you can construct a line perpendicular to another line by turning on Snaps to Angles in the Snapping settings and drawing a line from a point on the original line that looks close to 90°. However, in some cases you may need to construct a perpendicular line using classical methods. First make sure you have Shows Intersections turned on in the Canvas pane of the settings.

1. We are given a line AB and a point C through which the perpendicular line must pass.

20130205-121815.jpg

2. Choose the Arc tool, then drag the center handle of the compass to point C. Draw an arc (I used the light pencil) across line AB like this:

20130205-121956.jpg

3. Move the compass center to one intersection of the arc and line AB and draw two arcs as shown. This method essentially resembles the method of constructing a perpendicular bisector.

20130205-122136.jpg

4. Repeat the process with the other intersection.

20130205-122216.jpg

5. Choose the Line tool and draw a line through point C and the two intersections we just created. This line is perpendicular to line AB.

20130205-122258.jpg

Please leave a response if you have a question!

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