how to learn to draw the line of given measurement & place the protractor correctly & be familiar of the definitions of angles ?
how to use of geometrical instruments?
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Google "protractor how to use". You'll find articles and videos.
The other one you might want to look at is how to use a compass to draw circles. Look here http://www.mathsteacher.com.au/year8/ch10_geomcons/03_circles/comp.htm