Indestructible Perpendicular Lines
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Indestructible perpendicular lines are constructed using two circles. First draw one circle, and then a second, whose center lies outside of the first circle. Draw a line connecting the centers of the two circles. Then draw a line connecting the points of intersection of the circles. These two lines are perpendicular. No matter how big or small you now make the circles or rotate the circles, those two lines are indestructibly perpendicular.
Contributed by: Crystal Wiggins (March 2011)
Open content licensed under CC BY-NC-SA
"Indestructible Perpendicular Lines"
Wolfram Demonstrations Project
Published: March 7 2011