Perpendicular Bisectors

Jill Casey

You will be constructing 3 perpendicular bisectors in one triangle.


1. Select the triangle tool and create an acute, scalene triangle. Make sure to select the pointer tool afterwards in order to not keep creating polygons! 2. Select the point and line tool (4th from the left) and choose perpendicular bisector from the drop down menu. The directions on how to select the items in order to create a perpendicular bisector will appear at the bottom of the screen. (Select one segment.) 3. You will do this two more times to create three perpendicular bisectors.

What do you notice about the three perpendicular bisectors?

This point is special! You will discover why. Step 1: Choose the circle tool and circle with center through a point. Step 2: Click on the intersection of the perpendicular bisectors to make that point the center of a circle. Step 3: Drag the circle until you can click on one of the angles of the triangle.

What do you notice about this circle?