onstruction buttons You will be making constructions yourself using a set of buttons. Here is a simple guide to what each button does. Move a point by clicking and dragging. Add a point, by moving to the position you want and clicking (or by pressing, dragging then releasing) Construct a line through two points by clicking then dragging then clicking. Use the compass to draw a circle by clicking first where the centre is, then where the circumference is and last where you want this circle positioned. Construct a parallel to a line by first selecting that line and then dragging to a point. Construct a perpendicular to a line by first selecting that line and then dragging to a point. Construct a circle by choosing the centre and a point on the circumference. Construct the midpoint between two given points Bisect the angle between two lines. Construct a line at a fixed angle to a given line. Construct a conic from 5 given points. Measure the angle between two given lines. Undo your last step - and the step before that... Give a hint     Clear everything and start again. Check you understand these buttons The difference between &