Explain whether or not the given method of trisecting an angle, using only a carpenter's square, really works.

1 answer

The given method of trisecting an angle using only a carpenter's square is commonly referred to as "the Carpenter's Method" or "Archimedes' Method". It is based on a geometric construction technique but has been proven to be ineffective for true trisection of an angle.

In the Carpenter's Method, the angle is divided into two equal parts using the carpenter's square, and then those two parts are further divided using additional geometric constructions. The aim is to create three congruent angles within the original angle.

However, it has been mathematically proven that trisecting an angle using only a carpenter's square is impossible. This proof is rooted in the fact that angle trisection requires the use of cubic equations, which are beyond the scope of what is possible with simple geometric constructions.

Archimedes' Method, also known as the Carpenter's Method, may create three approximately equal angles, but they are not truly congruent. This approximation is not accurate enough for many mathematical applications where precise trisection is required.

Therefore, while the Carpenter's Method may provide a close approximation for practical purposes, it does not guarantee trisection of an angle and should not be relied upon for precise mathematical calculations. Other methods, such as using a compass and straightedge or advanced mathematical techniques, are required to accurately trisect an angle.