Lesson 13.1 The Premises of Geometry
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1 Lesson 13.1 The remises of Geometry 1. rovide the missing property of equality or arithmetic as a reason for each step to solve the equation. Solve for x: 5(x 4) 2x 17 Solution: 5(x 4) 2x 17 a. 5x 20 2x 17 3x x 37 x b. c. d. e. In Exercises 2 4, identify each statement as true or false. If the statement is true, tell which definition, property, or postulate supports your answer. If the statement is false, give a counterexample. 2. If M M, then M is the midpoint of. 3. If is on and is not, then m m If ST and KL, then ST KL. 5. omplete the flowchart proof. Given:,, Flowchart roof Given ostulate 84 HTER 13 iscovering Geometry ractice Your Skills 2008 Key urriculum ress
2 Lesson 13.2 lanning a Geometry roof For these exercises, you may use theorems added to your theorem list through the end of Lesson In Exercises 1 3, write a paragraph proof or a flowchart proof for each situation. 1. Given:, 2. Given: ST, R STU R UT R T U S 3. Given: Noncongruent, nonparallel segments,, and x y z 180 x a b y c z iscovering Geometry ractice Your Skills HTER Key urriculum ress
3 Lesson 13.3 Triangle roofs Write a proof for each situation. You may use theorems added to your theorem list through the end of Lesson Given: XY ZY, XZ WY W 2. Given:,, WXY WZY X M Z Y 3. Given: MN M, NO M, 4. Given:, E, is the midpoint of MO R MN RON E O E N M 86 HTER 13 iscovering Geometry ractice Your Skills 2008 Key urriculum ress
4 Lesson 13.4 uadrilateral roofs In Exercises 1 6, write a proof of each conjecture on a separate piece of paper. You may use theorems added to your theorem list through the end of Lesson The diagonals of a parallelogram bisect each other. (arallelogram iagonals Theorem) 2. If the diagonals of a quadrilateral bisect each other, then the quadrilateral is a parallelogram. (onverse of the arallelogram iagonals Theorem) 3. The diagonals of a rhombus bisect each other and are perpendicular. (Rhombus iagonals Theorem) 4. If the diagonals of a quadrilateral bisect each other and are perpendicular, then the quadrilateral is a rhombus. (onverse of the Rhombus iagonals Theorem) 5. If the base angles on one base of a trapezoid are congruent, then the trapezoid is isosceles. (onverse of the Isosceles Trapezoid Theorem) 6. If the diagonals of a trapezoid are congruent, then the trapezoid is isosceles. (onverse of the Isosceles Trapezoid iagonals Theorem) In Exercises 7 9, decide if the statement is true or false. If it is true, prove it. If it is false, give a counterexample. 7. quadrilateral with one pair of parallel sides and one pair of congruent angles is a parallelogram. 8. quadrilateral with one pair of congruent opposite sides and one pair of parallel sides is a parallelogram. 9. quadrilateral with one pair of parallel sides and one pair of congruent opposite angles is a parallelogram. iscovering Geometry ractice Your Skills HTER Key urriculum ress
5 Lesson 13.5 Indirect roof 1. omplete the indirect proof of the conjecture: In a triangle the side opposite the larger of two angles has a greater measure. Given: roof: with m m ssume ase 1: If, then is by. y,, which contradicts. So,. ase 2: If, then it is possible to construct point on such that, by the Segment uplication ostulate. onstruct, by the Line ostulate. is. omplete the proof In Exercises 2 5, write an indirect proof of each conjecture. 2. Given:, 3. If two sides of a triangle are not congruent, then the angles opposite them are not congruent. 4. If two lines are parallel and a third line in the same plane intersects one of them, then it also intersects the other. 88 HTER 13 iscovering Geometry ractice Your Skills 2008 Key urriculum ress
6 Lesson 13.6 ircle roofs Write a proof for each conjecture or situation. You may use theorems added to your theorem list through the end of Lesson If two chords in a circle are congruent, then their arcs are congruent. 2. Given: Regular pentagon E inscribed in circle O, with diagonals and and trisect E E O 3. Given: Two circles externally tangent at R, common external tangent segment TS T S TRS is a right angle R 4. Given: Two circles internally tangent at T with chords T and T of the larger circle intersecting the smaller circle at and T iscovering Geometry ractice Your Skills HTER Key urriculum ress
7 Lesson 13.7 Similarity roofs Write a proof for each situation. You may use theorems added to your theorem list through the end of Lesson Given: with 2 2. The diagonals of a trapezoid divide each other into segments with lengths in the same ratio as the lengths of the bases. 3. In a right triangle the product of the lengths of the two legs equals the product of the lengths of the hypotenuse and the altitude to the hypotenuse. 4. If a quadrilateral has one pair of opposite right angles and one pair of opposite congruent sides, then the quadrilateral is a rectangle. 90 HTER 13 iscovering Geometry ractice Your Skills 2008 Key urriculum ress
Lesson 13.1 The Premises of Geometry
Lesson 13.1 he remises of Geometry Name eriod ate 1. rovide the missing property of equality or arithmetic as a reason for each step to solve the equation. olve for x: 5(x 4) 15 2x 17 olution: 5(x 4) 15
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