Note that 135 = 90 + 45. So first construct a right angle, and then bisect the "back" half of it: Draw (horizontal) straight line XAB. Construct the perpendicular bisector
http://wiki.answers.com/Q/How_do_you_construct_ang...

1. a compass makes a circle, 360 degrees. 2. divide the circle in half with the straight edge, this line is 180 degrees. 3. use the edge to cut the circle in fourths, draw a line
http://answers.yahoo.com/question/index?qid=200710...

1. Draw a straight line lengthwise across the middle of your sheet of paper, using the ruler as a straight edge. Then choose a spot on the line, about 4 inches from the edge of the
http://www.ehow.com/how_8177212_construct70degre...

This can't be done (on the usual interpretation of "ruler & compass" construction). It is impossible. The proof of impossibility is far more advanced than the "
http://www.quora.com/Whatarethesimplewaystoc...
