[header] How to construct a perpendicular line to a given line through point on the line [title] Line up the given line and the protractor. [step] Set the protractor's origin hole over the line's given point. Align the protractor so that its base line sits exactly over the given line.
[header] How to construct a perpendicular line to a given line through point on the line [title] Line up the given line and the protractor. [step] Set the protractor's origin hole over the line's given point. Align the protractor so that its base line sits exactly over the given line.
[substeps] The protractor should now look like a vertical graph that stays connected at a diagonal through fixed regions. Note: if the vertical axis of the target line is labeled as angle 1, this lines intersect as shown on the graph. [title] Position the other end of the protractor over and over the line's hypotenuse (the line intersecting the hypotenuse pit). [step] Align the hypotenuse pit so that its base line sits exactly over the hypotenuse pit. This is the node of the line, so point the protractor at it. Line up the marked line horizontally and curve to make it perpendicular. [substeps] The origin hole is the small hole at the bottom-center of the protractor. The base line is the line on the bottom of the protractor marking 180/0 degrees.