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Browse High School Constructions

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Trisecting an Angle Using Compass and Straightedge [04/29/2004]
A student claims he can trisect an arbitrary angle with no measuring and only a straightedge and a compass, using Geometer's Sketchpad to prove his method is correct. Doctor Math talks about why a construction alone is not enough to prove the method.

Trisecting an Angle Using the Conchoid of Nicomedes [08/16/2002]
Is it possible that I could have trisected an angle using the Nichomedian conchoid?

Trisecting a Pizza [05/13/2002]
Without the use of a ruler, protractor or other measuring device, is there a simple way to divide a pizza into 3 equal sized slices?

Trisecting a Right Angle [12/16/1996]
An explanation of how to trisect a 90 degree angle, plus some constructions.

Why Straightedge and Compass Only? [10/02/2002]
My geometry students want to know why constructions can only be done using a straightedge and a compass.

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