## Book I. Proposition 46Problems 1. State the defintion of a square. A square is a quadrilateral in which all the sides are equal, and all the angles are right angles. 2. a) In Proposition 46, what is given? A straight line. 2. b) What are we asked to do? To draw a straight line on it. 2. c) Practice Proposition 46. 3. Prove: 4. ABCD is a square, and angle ADE is a right angle. Prove that the
First, DE is in a straight line with CD. (I. 14) 5. a) Prove: 5. b) State and prove the converse.
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