Using a compass and a straight edge to create two dimensional figures shows the geometry of a figure. Note that the constructions can also be done using the 2D sketch features of modeling software. Here is a link to step-by-step animated tutorials for these geometric constructions on the Math is Fun website. Another construction site is http://www.mathopenref.com/constructions.html .
Link to constructing a 60 degree angle or an equilateral triangle ( also equilangular) video https://www.youtube.com/watch?v=eISDJl_BKuA
Link to bisecting and constructing 30, 45, 60, 90, 120 degree angles videohttps://www.youtube.com/watch?v=5l8bltVe_IE
Link to video creating a 75 degree angle
https://www.youtube.com/watch?v=lYVsdNW_k3Y
Link to constructing a 60 degree angle or an equilateral triangle ( also equilangular) video https://www.youtube.com/watch?v=eISDJl_BKuA
Link to bisecting and constructing 30, 45, 60, 90, 120 degree angles videohttps://www.youtube.com/watch?v=5l8bltVe_IE
Link to video creating a 75 degree angle
https://www.youtube.com/watch?v=lYVsdNW_k3Y
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