## Book I. Proposition 20Problems 1. a) State the hypothesis of Proposition 20. These are any two sides of a triangle. 1. b) State the conclusion. Together they will be greater than the third side. 1. c) Practice Proposition 20.
3. a) Can an isosceles triangle have sides in the ratio 1 : 1 : 2? No. The equal sides 1 + 1 are not greater than 2.
2 : 3 : 4 5. A scalene triangle has one side that is 2 cm. Can the remaining sides Table of Contents | Introduction | Home Copyright © 2017 Lawrence Spector Questions or comments? E-mail: themathpage@yandex.com Private tutoring available. |