Construct with ruler and compasses, an angle of .
Let's construct an angle by following the steps -
Step 1: Draw a line and mark a point on it. Consider as the center and with a convenient radius on the compass, draw an arc of a circle such that it intersects the line at .
Step 2: Consider as the center and with the same radius as before, draw an arc intersecting the previously drawn arc at point .
Step 3: Join . is the required ray making with the line .
Hence, the above drawn angle is required angle.