# 7. 6 Justifying Constructions

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1 Justifying Constructions A Solidify Understanding Task CC BY THOR Compass and straightedge constructions can be justified using such tools as: the definitions and properties of the rigid-motion transformations identifying corresponding parts of congruent triangles using observations about sides, angles and diagonals of special types of quadrilaterals Study the steps of the following procedure for constructing an angle bisector, and complete the illustration based on the descriptions of the steps. Steps Using a compass, draw an arc (portion of a circle) that intersects each ray of the angle to be bisected, with the center of the arc located at the vertex of the angle. Illustration Without changing the span of the compass, draw two arcs in the interior of the angle, with the center of the arcs located at the two points where the first arc intersected the rays of the angle. With the straightedge, draw a ray from the vertex of the angle through the point where the last two arcs intersect. Explain in detail why this construction works. It may be helpful to identify some congruent triangles or a familiar quadrilateral in the final illustration. You may also want to use definitions or properties of the rigid-motion transformations in your explanation. Be prepared to share your explanation with your peers.

2 32 Study the steps of the following procedure for constructing a line perpendicular to a given line through a given point, and complete the illustration based on the descriptions of the steps. Steps Using a compass, draw an arc (portion of a circle) that intersects the given line at two points, with the center of the arc located at the given point. Illustration Without changing the span of the compass, locate a second point on the other side of the given line, by drawing two arcs on the same side of the line, with the center of the arcs located at the two points where the first arc intersected the line. With the straightedge, draw a line through the given point and the point where the last two arcs intersect. Explain in detail why this construction works. It may be helpful to identify some congruent triangles or a familiar quadrilateral in the final illustration. You may also want to use definitions or properties of the rigid-motion transformations in your explanation. Be prepared to share your explanation with your peers.

3 33 Study the steps of the following procedure for constructing a line parallel to a given line through a given point, and complete the illustration based on the descriptions of the steps. Steps Using a straightedge, draw a line through the given point to form an arbitrary angle with the given line. Illustration Using a compass, draw an arc (portion of a circle) that intersects both rays of the angle formed, with the center of the arc located at the point where the drawn line intersects the given line. Without changing the span of the compass, draw a second arc on the same side of the drawn line, centered at the given point. The second arc should be as long or longer than the first arc, and should intersect the drawn line. Set the span of the compass to match the distance between the two points where the first arc crosses the two lines. Without changing the span of the compass, draw a third arc that intersects the second arc, centered at the point where the second arc intersects the drawn line. With the straightedge, draw a line through the given point and the point where the last two arcs intersect. Explain in detail why this construction works. It may be helpful to identify some congruent triangles or a familiar quadrilateral in the final illustration. You may also want to use definitions or properties of the rigid-motion transformations in your explanation. Be prepared to share your explanation with your peers.

4 7. 6 Justifying Constructions Teacher Notes A Develop Understanding Task Purpose: In previous tasks students have invented strategies for constructing various polygons: rhombuses, squares, parallelograms, equilateral triangles, and regular hexagons. Embedded within these constructions are the ideas of the standard constructions: copying a segment, copying an angle, bisecting a segment, bisecting an angle, constructing parallel and perpendicular lines through given points. In this task students examine the details of the standard constructions and justify them based on properties of quadrilaterals, corresponding parts of congruent triangles, and the definitions of the rigid-motion transformations. Core Standards Focus: G.CO.12 Make formal geometric constructions with a variety of tools and methods (compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, etc.). Copying a segment; copying an angle; bisecting a segment; bisecting an angle; constructing perpendicular lines, including the perpendicular bisector of a line segment; and constructing a line parallel to a given line through a point not on the line. G.CO.13 Construct an equilateral triangle, a square, and a regular hexagon inscribed in a circle. See also Mathematics I note for G.CO.12, G.CO.13: Build on prior student experience with simple constructions. Emphasize the ability to formalize and defend how these constructions result in the desired objects. Some of these constructions are closely related to previous standards and can be introduced in conjunction with them. Standards for Mathematical Practice of Focus in the Task: SMP 3 Construct viable arguments and critique the reasoning of others SMP 7 Look for and make use of structure

5 The Teaching Cycle: Launch (Whole Class): Point out that in each chart students have been given an incomplete illustration of the construction steps that are outlined in the first column of the chart. They are to follow the steps to complete the illustration, then write a justification as to why the construction works. Explore (Small Group): Monitor students as they complete the illustrations of each construction. Listen for the ways students justify why the construction works. You may need to help students see the underlying congruent triangles or quadrilaterals on which the constructions are based. For example, the construction of the angle bisector is based on constructing a rhombus and its diagonal. Since we have conjectured that the diagonal of a rhombus bisects the angles through which it is drawn, we can justify this construction on that basis. Alternatively, we could look for congruent triangles formed by this line, or use this line as a line of reflection, in order to justify this construction in other ways. Select students to present who have developed thoughtful arguments justifying each construction. Discuss (Whole Class): Have selected students demonstrate how the steps for the constructions lead to the desired objects, and then justify the construction based on congruent triangles, properties of quadrilaterals, or definitions of transformations. Aligned Ready, Set, Go: Congruence, Construction and Proof 7.6

6 READY, SET, GO! Name Period Date READY Topic: Rotational symmetry in regular polygons and with transformations. 1. What angles of rotational symmetry are there for a regular pentagon? 2. What angles of rotational symmetry are there for a regular hexagon? 3. If a regular polygon has an angle of rotational symmetry that is 40 0, how many sides does the polygon have? On each given coordinate grid below perform the indicated transformation C P P j Reflect point P over line j. Rotate point P 90 0 clockwise around point C.

7 SET Topic: Use Triangle Congruence Criteria to justify conjectures. 6. Construct an isosceles triangle that incorporates CD as one of the sides. Construct the circumscribed circle around the triangle. 7. Construct a regular hexagon that incorporates CD as one of the sides. Construct the circumscribed circle around the hexagon. 8. Construct a square that incorporates CD as one of the sides. Construct the circumscribed circle around the square.

8 GO Topic: Finding Distance and Slope. For each pair of given coordinate points find distance between them and find the slope of the line that passes through them. Show all your work. 9. (-2, 8), (3, -4) 10. (-7, -3), (1, 5)) a. Slope: b. Distance: a. Slope: b. Distance: 11. (3, 7), (-5, 9) 12. (1, -5) (-7, 1) a. Slope: b. Distance: a. Slope: b. Distance: 13. ( -10, 31) (20, 11) 14. (16, -45) (-34, 75) a. Slope: b. Distance: a. Slope: b. Distance:

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