# Special Angles on Parallel Lines

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1 Page 1 of 12 L E S S O N 2.6 The greatest mistake you can make in life is to be continually fearing that you will make one. ELLEN HUBBARD Special Angles on Parallel Lines A line intersecting two or more other lines in the plane is called a transversal. A transversal creates different types of angle pairs. Three types are listed below. One pair of corresponding angles is Can you find three more pairs of corresponding angles? One pair of alternate interior angles is Do you see another pair of alternate interior angles? One pair of alternate exterior angles is Do you see the other pair of alternate exterior angles? When parallel lines are cut by a transversal, there is a special relationship among the angles. Let s investigate. Step 1 Step 2 Using the lines on your paper as a guide, draw a pair of parallel lines. Or use both edges of your ruler or straightedge to create parallel lines. Label them k and Now draw a transversal that intersects the parallel lines. Label the transversal m, and label the angles with numbers, as shown at right. Place a piece of patty paper over the set of angles 1, 2, 3, and 4. Copy the two intersecting lines m and and the four angles onto the patty paper. Slide the patty paper down to the intersection of lines m and k, and compare angles 1 through 4 with each of the corresponding angles 5 through 8. What is the relationship between corresponding angles? Alternate interior angles? Alternate exterior angles? 128 CHAPTER 2 Reasoning in Geometry

2 Page 2 of 12 Compare your results with the results of others in your group and complete the three conjectures below. If two parallel lines are cut by a transversal, then corresponding angles are If two parallel lines are cut by a transversal, then alternate interior angles are If two parallel lines are cut by a transversal, then alternate exterior angles are The three conjectures you wrote can all be combined to create a Parallel Lines Conjecture, which is really three conjectures in one. If two parallel lines are cut by a transversal, then corresponding angles are alternate interior angles are and alternate exterior angles are Step 3 What happens if the lines you start with are not parallel? Check whether your conjectures will work with nonparallel lines. LESSON 2.6 Special Angles on Parallel Lines 129

3 Page 3 of 12 What about the converse of each of your conjectures? Suppose you know that a pair of corresponding angles, or alternate interior angles, is congruent. Will the lines be parallel? Is it possible for the angles to be congruent but for the lines not to be parallel? Step 1 Step 2 Step 3 Draw two intersecting lines on your paper. Copy these lines onto a piece of patty paper. Because you copied the angles, the two sets of angles are congruent. Slide the top copy so that the transversal stays lined up. Trace the lines and the angles from the bottom original onto the patty paper again. When you do this, you are constructing sets of congruent corresponding angles. Mark the congruent angles. Are the two lines parallel? You can test to see if the distance between the two lines remains the same, which guarantees that they will never meet. Repeat Step 1, but this time rotate your patty paper 180 so that the transversal lines up again. What kinds of congruent angles have you created? Trace the lines and angles and mark the congruent angles. Are the lines parallel? Check them. Compare your results with those of your group. If your results do not agree, discuss them until you have convinced each other. Complete the conjecture below and add it to your conjecture list. If two lines are cut by a transversal to form pairs of congruent corresponding angles, congruent alternate interior angles, or congruent alternate exterior angles, then the lines are 130 CHAPTER 2 Reasoning in Geometry

4 Page 4 of 12 keymath.com/dg For an interactive version of both investigations, see the Dynamic Geometry Exploration Special Angles on Parallel Lines at Developing Proof You used inductive reasoning to discover all three parts of the Parallel Lines Conjecture. However, if you accept any one of them as true, you can use deductive reasoning to show that the others are true. Read the example below. Before you read the solution, write a deductive argument with your group. Remember the reasoning strategy of applying previous conjectures and definitions. Then compare your solution to the one presented. EXAMPLE Solution It helps to visualize each statement and to mark all congruences you know on your paper. Write a deductive argument explaining why the Alternate Interior Angles Conjecture is true. Assume that the Vertical Angles Conjecture and Corresponding Angles Conjecture are both true. Deductive Argument In the diagram, lines and are parallel and intersected by transversal k. If the Corresponding Angles Conjecture is true, the corresponding angles are congruent. If the Vertical Angles Conjecture is true, the vertical angles are congruent. Because both and are congruent to they re congruent to each other. Alternate interior angles 2 and 3 are congruent. Therefore, if the corresponding angles are congruent, then the alternate interior angles are congruent. EXERCISES 1. w = Is line k parallel to line LESSON 2.6 Special Angles on Parallel Lines 131

5 Page 5 of Quadrilateral TUNA is 5. Is quadrilateral FISH 6. a parallelogram. a parallelogram? 7. Developing Proof Trace the diagram below. Calculate each lettered angle measure. Explain how you determined measures n, p,and q. 8. Developing Proof Write a deductive argument explaining why the Alternate Exterior Angles Conjecture is true. Assume that the Vertical Angles Conjecture and Corresponding Angles Conjecture are both true. Cultural Sculptor Maya Lin designed the Vietnam Veterans Memorial Wall in Washington, D.C. Engraved in the granite wall are the names of United States armed forces service members who died in the Vietnam War or remain missing in action. Do the top and bottom of the wall meet in the distance, or are they parallel? How could you know from angle measures a and b in the diagram below? To learn more about the Memorial Wall and Lin s other projects, visit 132 CHAPTER 2 Reasoning in Geometry

6 Page 6 of Developing Proof What s wrong with this picture? 10. Developing Proof What s wrong with this 11. A periscope permits a sailor on a submarine to see above the surface of the ocean. This periscope is designed so that the line of sight a is parallel to the light ray b. The middle tube is perpendicular to the top and bottom tubes. What are the measures of the incoming and outgoing angles formed by the light rays and the mirrors in this periscope? Are the surfaces of the mirrors parallel? How do you know? 12. Draw a line on your paper and label it line AB. Place a point P about one to two inches from the line. Draw another line (a transversal) that passes through point P and line AB. Use your straightedge and protractor to draw line PQ that is parallel to line AB. Explain your method and why you know the lines are parallel. 13. Is the following statement true? If yesterday was part of the weekend, then tomorrow is a school day. Write the converse of the statement. Is the converse true? 14. Find x Review 17. What type (or types) of triangle has one or more lines of symmetry? 18. What type (or types) of quadrilateral has only rotational symmetry? 19. If D is the midpoint of and C is the midpoint of what is the length of if BD = 12 cm? 20. If is the angle bisector of and is the angle bisector of what is m if m 13? 21. If everyone in the town of Skunk s Crossing (population 84) has a telephone, how many different lines are needed to connect all the phones to each other? 22. How many squares of all sizes are in a 4-by-4 grid of squares? (There are more than 16!) LESSON 2.6 Special Angles on Parallel Lines 133

7 Page 7 of 12 For Exercises 23 25, draw each polygon on graph paper. Relocate the vertices according to the rule. Connect the new points to form a new polygon. Describe what happened to the figure. Is the new polygon congruent to the original? 23. Rule: Subtract 1 from 24. Rule: Reverse the sign of 25. Rule: Switch the each x-coordinate. each x- and y-coordinate. x- and y-coordinates. Pentagon LEMON with vertices: 26. Assume the pattern of blue and yellow shaded T s continues. Copy and complete the table for blue and yellow squares and for the total number of squares. Can you use your graphing calculator to make the line design shown at right? You ll need to recall some algebra. Here are some hints. 1. The design consists of the graphs of seven lines. 2. The equation for one of the lines is 3. The x- and y-ranges are set to minimums of 0 and maximums of There s a simple pattern in the slopes and y-intercepts of the lines. Experiment with equations to create your own line design. Your project should include A set of equations for the design shown here. Your own line design and a set of equations for it. 134 CHAPTER 2 Reasoning in Geometry

8 Page 8 of 12 Slope The slope of a line is a measure of its steepness. Measuring slope tells us the steepness of a hill, the pitch of a roof, or the incline of a ramp. On a graph, slope can tell us the rate of change, or speed. To calculate slope, you find the ratio of the vertical distance to the horizontal distance traveled, sometimes referred to as rise over run. slope One way to find slope is to use a slope triangle. Then use the coordinates of its vertices in the formula. The slope m of a line (or segment) through two points with coordinates EXAMPLE Draw the slope triangle and find the slope for. Solution Draw the horizontal and vertical sides of the slope triangle below the line. Use them to calculate the side lengths. Note that if the slope triangle is above the line, you subtract the numbers in reverse order, but still get the same result. USING YOUR ALGEBRA SKILLS 2 Slope 135

9 Page 9 of 12 The slope is positive when the line goes up from left to right. The slope is negative when the line goes down from left to right. When is the slope 0? What is the slope of a vertical line? EXERCISES In Exercises 1 3, find the slope of the line through the given points. 1. (16, 0) and (12, 8) 2. ( 3, 4) and ( 16, 8) 3. (5.3, 8.2) and (0.7, 1.5) 4. A line through points ( 5, 2) and (2, y) has slope 3. Find y. 5. A line through points (x, 2) and (7, 9) has slope Find x. 6. Find the coordinates of three more points that lie on the line passing through the points (0, 0) and (3, 4). Explain your method. 7. What is the speed, in miles per hour, represented by Graph A? 8. From Graph B, which in-line skater is faster? How much faster? 9. The grade of a road is its slope, given as a percent. For example, a road with a 6% grade has slope It rises 6 feet for every 100 feet of horizontal run. Describe a 100% grade. Do you think you could drive up it? Could you walk up it? Is it possible for a grade to be greater than 100%? 10. What s the slope of the roof on the adobe house? Why might a roof in Connecticut be steeper than a roof in the desert? 136 CHAPTER 2 Reasoning in Geometry

10 Page 10 of 12 Patterns in Fractals In Lesson 2.1, you discovered patterns and used them to continue number sequences. In most cases, you found each term by applying a rule to the term before it. Such rules are called recursive rules. Some picture patterns are also generated by recursive rules. You find the next picture in the sequence by looking at the picture before it and comparing that to the picture before it, and so on. The Geometer s Sketchpad can repeat a recursive rule on a figure using a command called Iterate. Using Iterate, you can create the initial stages of fascinating geometric figures called fractals. Fractals are self-similar, meaning that if you zoom in on a part of the figure, it looks like the whole. A true fractal would need infinitely many applications of the recursive rule. In this exploration, you ll use Iterate to create the first few stages of a fractal called the Sierpiński triangle. In this procedure you will construct a triangle, its interior, and midpoints on its sides. Then you will use Iterate to repeat the process on three outer triangles formed by connecting the midpoints and vertices of the original triangle. EXPLORATIONPatterns in Fractals 137

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