Question: Geometry - how to draw triangles, circles, polygons, etc

Hi, can you advise how I can draw geometry objects like circle, triangles, polygons, angles in triangles, etc accurately -- I need the gepmetric shapes to be to-scale -- in other words, if I need an angle at 50-degrees, I don't wish to eye-ball it, but I really need it to be 50-degrees. Thanks!
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