## Book I. Proposition 16Problems Back to Proposition 16. 1. In triangle DEF, side EF has been extended to G. 1. a) Name that To see the answer, pass your mouse over the colored area. Angle GFD. 1. b) Name the two angles that are Angles FED, EDF. 1. c) Name the angle that is Angle DFE. 2. a) State the hypothesis of Proposition 16. One of the sides of a triangle is extended. 2. b) State the conclusion. The exterior angle is greater than either of the opposite interior angles. 2. c) Practice Proposition 16. 3. Prove: That is, the straight lines AB, AC, AC cannot be equal in length, [
If AB is equal to AC, then in triangle ACB, 4. Prove:
From the point A there is only one perpendicular AB to the straight line DE.
For suppose that AC is also a perpendicular to DE. 5. a) State the hypothesis of Proposition 17. This figure is a triangle. 5. b) State the conclusion. And two of its angles are together less than two right angles. 5. c) Practice Proposition 17. Table of Contents | Introduction | Home Please make a donation to keep TheMathPage online. Copyright © 2012 Lawrence Spector Questions or comments? E-mail: themathpage@nyc.rr.com |