Apps, Geometry, Isosceles

Isosceles Tutorial: Bisecting an Angle Traditionally

Bisecting an angle is a common task in geometry. There is a shortcut in Isosceles to construct a bisector, but sometimes one may need to do this traditionally. First, make sure you have Shows Intersections turned on in the Canvas pane of the Settings.

1. Tap to create a point.

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2. Select the Line tool and drag from the point to create one leg of the angle.

20130128-194901.jpg

3. Draw the other leg. Your angle should look somewhat like this:

20130128-194928.jpg

4. Select the Compass tool. The compass will appear in blue across the diagram.

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5. Drag the center handle of the compass to point A. Resize the compass if necessary by dragging the outer handle toward the center.

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6. Tap the pencil icon to change to the light gray pencil. Drag the outer handle across the angle to draw an arc. Be sure to keep your finger close to the blue circle so that the compass does not resize.

20130128-195216.jpg

7. Move the compass to one of the intersections between the arc and the angle. Draw another arc in the center of the angle. Repeat this step with the other intersection. Then select the Line tool to hide the compass. Your diagram should look similar to this:

20130128-195333.jpg

8. Draw a line from point A that passes reasonably close to the intersection of the last two arcs. Isosceles will snap the line to pass through the intersection. This new line, AD, is the angle bisector of angle BAC.

20130128-195442.jpg

Please leave a comment if you have any questions!

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