Draw a line segment and with compass do the following,
1. Take more than half of line segment in compass.
2. From the left end point draw arc on the upper side and lower side of line segment.
3. Draw arc in the same way from right end point such that the arc should cut the arc from left end point .
4. Now join the points in the upper and lower side of the segment where the arcs drawn from left and right end points intersect.
5.you will get perpendicular bisector [ angle of 90 ]
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You'll also need a protractor to construct a 220 degree angle which can then be bisected by means of a compass and a straight line to form two 110 degree angles.
To construct a 54-degree angle with a compass, start by drawing a straight line using a ruler. Place the compass on one endpoint of the line and draw an arc that intersects the line. Without changing the compass width, place the compass on the intersection point and draw another arc. Where the two arcs intersect is a point that, when connected to the endpoint of the line, forms a 54-degree angle.
A compass and a straightedge
With a protractor
to construct an angle of 20 degrees all you have to do is to trisect an angle of 60degrees