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Thought-Process to Discover Knowledge

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Books and other education websites provide "matter-of-fact" knowledge. Instead, nubtrek provides a thought-process to discover knowledge.

In each of the topic, the outline of the thought-process, for that topic, is provided for learners and educators.

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In this page, a short and to-the-point overview of constructing `120^@` angle using a compass is provided.



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Which of the following help to construct `120^@` angle using a compass?

  • construct `60^@` on top of another `60^@` angle. Both together form `120^@`
  • construct `60^@` on top of another `60^@` angle. Both together form `120^@`
  • `120^@` angle cannot be constructed using a compass

The answer is "construct `60^@` on top of another `60^@` angle. Both together form `120^@`"

Constructing `60^@` angle twice-over to construct `120^@`construct 120 degree  •  With an arbitrary distance-measure on compass, mark point `P` from point `A` on line `bar(AB)`.

 •  With the same distance measure on compass, construct two arcs from points `A` and `P`. The arcs cut at point `Q`. `bar(AQ)` makes `60^@` with the `bar(AP)`.

 •  With the same distance measure on compass, construct two arcs from points `A` and `Q`. The arcs cut at point `R`. `bar(AR)` makes `120^@` with the `bar(AP)`. The angle `120^@` is constructed as `/_PAR`.

Constructing `120^@` angle using a Compass : Construct an equilateral triangle and another equilateral triangle on the side of the constructed one.construct 120 degree

                            
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