## Book I. Propositions 11 and 12Problems Back to Propositions 11 and 12. 1. Draw a straight line, choose a point on it, and at that point draw a 2. a) In Proposition 11, what are we given? To see the answer, pass your mouse over the colored area. A straight line and a point on it. 2. b) What are we required to do? To draw a straight line perpendicular to the given line, at the given point. 2. c) Practice Proposition 11. 3. Use the indirect method to prove: 4. To a straight line, and from a point not on it, drop a perpendicular 5. a) In Proposition 12, what are we given? A straight line that may be made as long as we please, and a point not on it. 3. b) What are we required to do? To draw a perpendicular to the given line, from the given point. 3. c) Practice Proposition 12. Table of Contents | Introduction | Home Please make a donation to keep TheMathPage online. Copyright © 2017 Lawrence Spector Questions or comments? E-mail: themathpage@nyc.rr.com |