line AB intersects plane Q at W
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Draw and label line Ab
A Segment Bisector
Using a compass and ruler: # At the point you want the perpendicular line to cross, place a dot. Label it A. # Draw a circle centred at A with a radius of about an inch (two-three centimetres). Label the points it intersects the original line as B and C. # Construct two circles centred at B and C, large enough that they almost reach the other point and have the same size. Label the points they intersect at as D and E. # Draw a straight line between E and D. This line is the perpendicular line. This method can also be used to draw a perpendicular bisector, if the ends of the line you wish to bisect are labelled as points B and C.
Using a compass and ruler: # Label the ends of the line you wish to bisect as A and B. # Construct two circles centred at A and B, large enough that they almost reach the other point and have the same size. Label the points they intersect at as C and D. # Draw a straight line between C and D. The point it intersects the original line is the halfway point; any bisector must pass through that point.
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