Question 40: Construct 90 degrees with the help of ruler and compass.
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Method 2 of 2: Through the Middle of a Line Segment
Draw a straight line. On a piece of paper, draw a line segment of any convenient length. ...
Pick any point on AB. Mark it, and label it O. ...
Grab a compass. Open the compass to a radius a little shorter than either AO or OB. ...
Strike two more arcs. ...
Draw the 90° angle....
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