In this episode we talk about three important uses of the word square. Then we drill down into the term square as used by craftsmen and builders. We then talk about square from a geometry point of view and describe the meaning of a parallelogram, a rectangle and a square.

Next we drive home the craftsman use of the word square meaning a right or 90 degree angle.

We then talk about 3 ways of determining if we correctly have a right angle. The first is using tools also called squares. The 2nd is a rule I call the 3,4, 5 rule which is a special case of the Pythagorean theorem and really the only case that is useful for construction. The final method is the measuring diagonal method for “squaring up” a rectangle.

The following PDF will be very helpful to download and view while listening to the audio file. Notes and Pictures for Episode 5 – Making Things Square.

In addition this pdf is a table of 3,4, 5 calculations for right angles in both English and Metric values from approximately 9 inches up to about 30 ft. 3, 4, 5 table.

I want to apologize for the very bad sound quality of this presentation. I expect some background noise in these because I record these during my commute to work. However, this was worse than usual. Please put-up with me while I work through the bugs, but I felt this information is helpful to anyone considering doing some construction and I should get it out, bad audio and all.

Gary.

[…] The right triangle is very useful because there is a formula that determines the relationship of the length of the three sides. That formula is called the Pythagorean Theorem. This is commonly used to help “square up” (making perpendicular) the sides of structures by a common use of this relationship using the numbers 3, 4 and 5. (See my previous post Episode 5 – Making things square.) […]

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