Student Outcomes. Lesson Notes. Classwork. Opening Exercise (3 minutes)
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1 Student Outcomes Students solve problems related to the distance between points that lie on the same horizontal or vertical line Students use the coordinate plane to graph points, line segments and geometric shapes in the various quadrants and then use the absolute value to find the related distances Lesson Notes The grid provided in the Opening Exercise is also used for Exercises 1 6 since each exercise is sequential Students extend their knowledge about finding distances between points on the coordinate plane to the associated lengths of line segments and sides of geometric figures Classwork Opening Exercise (3 minutes) Opening Exercise In the coordinate plane, find the distance between the points using absolute value The distance between the points is units The points have the same first coordinates and therefore lie on the same vertical line, and, and the numbers lie on opposite sides of so their absolute values are added together; We can check our answer by just counting the number of units between the two points Date: 4/1/ Common Core, Inc Some rights reserved commoncoreorg Creative Commons Attribution NonCommercial ShareAlike 30 Unported License
2 Exercises 1 2 (8 minutes): The Length of a Line Segment is the Distance Between its Endpoints Students relate the distance between two points lying in different quadrants of the coordinate plane to the length of a line segment with those endpoints Students then use this relationship to graph a horizontal or vertical line segment using distance to find the coordinates of endpoints Exercises 1 Locate and label and, Draw the line segment between the endpoints given on the coordinate plane How long is the line segment that you drew? Explain The length of the line segment is also units I found that the distance between and is units, and because these are the endpoints of the line segment, the line segment begins and ends at these points, so the distance from end to end is units 2 Draw a horizontal line segment starting at that has a length of units What are the possible coordinates of the other endpoint of the line segment? (There is more than one answer) or, units Which point do you choose to be the other endpoint of the horizontal line segment? Explain how and why you chose that point Locate and label the point on the coordinate grid The other endpoint of the horizontal line segment is ; I chose this point because the other option, is located off of the given coordinate grid Note: Students may choose the endpoint but they must change the number scale of the axis to do so Exercise 3 (5 minutes): Extending Lengths of Line Segments to Sides of Geometric Figures The two line segments that you have just drawn could be seen as two sides of a rectangle Given this, the endpoints of the two line segments would be three of the vertices of this rectangle 3 Find the coordinates of the fourth vertex of the rectangle Explain how you find the coordinates of the fourth vertex using absolute value The fourth vertex is The opposite sides of a rectangle are the same length, so the length of the vertical side starting at has to be units long Also, the side from to, the remaining vertex is a vertical line, so the endpoints must have the same first coordinate, and, so the remaining vertex must be five units above the axis MP7 *Students can use a similar argument using the length of the horizontal side starting at, knowing it has to be units long How does the fourth vertex that you found relate to each of the consecutive vertices in either direction? Explain The fourth vertex has the same first coordinate as because they are the endpoints of a vertical line segment The fourth vertex has the same second coordinate as since they are the endpoints of a horizontal line segment Draw the remaining sides of the rectangle Date: 4/1/ Common Core, Inc Some rights reserved commoncoreorg Creative Commons Attribution NonCommercial ShareAlike 30 Unported License
3 Exercises 4 6 (6 minutes): Using Lengths of Sides of Geometric Figures to Solve Problems 4 Using the vertices that you have found and the lengths of the line segments between them, find the perimeter of the rectangle ; The perimeter of the rectangle is units 5 Find the area of the rectangle Scaffolding: Students may need to review and discuss the concepts of perimeter and area from earlier grades ; The area of the rectangle is 6 Draw a diagonal line segment through the rectangle with opposite vertices for endpoints What geometric figures are formed by this line segment? What are the areas of each of these figures? Explain The diagonal line segment cuts the rectangle into two right triangles The areas of the triangles are each because the triangles each make up half of the rectangle and half of is EXTENSION [If time allows]: Line the edge of a piece of paper up to the diagonal in the rectangle Mark the length of the diagonal on the edge of the paper Align your marks horizontally or vertically on the grid and estimate the length of the diagonal to the nearest integer Use that estimation to now estimate the perimeter of the triangles, The length of the diagonal is approximately units, and the perimeter of each triangle is approximately units Exercise 7 (8 minutes) MP1 7 Construct a rectangle on the coordinate plane that satisfies each of the criteria listed below Identify the coordinate of each of its vertices Each of the vertices lies in a different quadrant Y Its sides are either vertical or horizontal The perimeter of the rectangle is 28 units Answers will vary The example to the right shows a rectangle with side lengths and units The coordinates of the rectangle s vertices are,, and X Using absolute value, show how the lengths of the sides of your rectangle provide a perimeter of units,, and, so the width of my rectangle is units,, and, so the height of my rectangle is units ; The perimeter of my rectangle is units Date: 4/1/ Common Core, Inc Some rights reserved commoncoreorg Creative Commons Attribution NonCommercial ShareAlike 30 Unported License
4 Closing (5 minutes) How do we determine the length of a horizontal line segment whose endpoints lie in different quadrants of the coordinate plane? If the points are in different quadrants, then the coordinates lie on opposite sides of zero The distance between the coordinates can be found by adding the absolute values of the coordinates (The coordinates are the same and show that the points lie on a horizontal line) If we know one endpoint of a vertical line segment and the length of the line segment, how do we find the other endpoint of the line segment? Is the process the same with a horizontal line segment? If the line segment is vertical, then the other endpoint could be above or below the given endpoint If we know the length of the line segment then we can count up or down from the given endpoint to find the other endpoint We can check our answer using the absolute values of the coordinates Lesson Summary The length of a line segment on the coordinate plane can be determined by finding the distance between its endpoints You can find the perimeter and area of figures such as rectangles and right triangles by finding the lengths of the line segments that make up their sides, and then using the appropriate formula Exit Ticket (10 minutes) Date: 4/1/ Common Core, Inc Some rights reserved commoncoreorg Creative Commons Attribution NonCommercial ShareAlike 30 Unported License
5 Name Date Exit Ticket 1 The coordinates of one endpoint of a line segment are 2, 7 The line segment is 12 units long Give three possible coordinates of the line segment s other endpoint 2 Graph a rectangle with area 12 units 2, such that its vertices lie in at least two of the four quadrants in the coordinate plane State the lengths of each of the sides, and use absolute value to show how you determined the lengths of the sides Y X Date: 4/1/ Common Core, Inc Some rights reserved commoncoreorg Creative Commons Attribution NonCommercial ShareAlike 30 Unported License
6 Exit Ticket Sample Solutions 1 The coordinates of one endpoint of a line segment are The line segment is units long Give three possible coordinates of the line segment s other endpoint ; ; ; 2 Graph a rectangle with area units 2, such that its vertices lie in at least two of the four quadrants in the coordinate plane List the lengths of the sides, and use absolute value to show how you determined the lengths of the sides Answers will vary The rectangle can have side lengths of and or and A sample is provided on the grid on the right Y 2 units 1 unit 1 unit 3 units 6 units X 3 units Problem Set Sample Solutions Please provide students with three coordinate grids to use in completing the Problem Set 1 One endpoint of a line segment is The length of the line segment is units Find four points that could serve as the other endpoint of the given line segment ; ; ; 2 Two of the vertices of a rectangle are and If the rectangle has a perimeter of units, what are the coordinates of its other two vertices? and ; or and 3 A rectangle has a perimeter of units, an area of square units, and sides that are either horizontal or vertical If one vertex is the point and the origin is in the interior of the rectangle, find the vertex of the rectangle that is opposite Date: 4/1/ Common Core, Inc Some rights reserved commoncoreorg Creative Commons Attribution NonCommercial ShareAlike 30 Unported License
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