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Line Reflections

Line Reflections. Review. Mrs. Erickson. The Coordinate Axes. y-axis. (x,y). Origin: (0,0). x -axis. The Coordinate Axes. Graph, then find the area: A (3,2 ) B (- 3,2) C (- 3,-2) D ( 3,-2 ) A (4,1 ) B ( 1,5) C (- 2,1). The Coordinate Axes. y.

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Line Reflections

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  1. Line Reflections Review Mrs. Erickson

  2. The Coordinate Axes y-axis (x,y) Origin: (0,0) x-axis

  3. The Coordinate Axes Graph, then find the area: • A (3,2) B (-3,2) C (-3,-2) D (3,-2) • A (4,1) B (1,5) C (-2,1)

  4. The Coordinate Axes y Graph, then find the area: A (3,2) B (-3,2) C (-3,-2) D (3,-2) B (-3,2) A (3,2) x 4 6 A=base x height C (-3,-2) D (3,-2) A=6x4 A=24

  5. The Coordinate Axes y B (1,5) Graph, then find the area: A (4,1) B (1,5) C (-2,1) 4 6 C (-2,1) A (4,1) x A=½ x base x height A=½ x 6 x 4 A=12

  6. The Coordinate Axes Solve: (x,y)  (2-x,y) • (0,1)  _____ • (-4,3)  _____ • (5,-1)  _____ (2,1) (6,3) (-3,-1)

  7. Line Reflections

  8. Line Reflections Lines of Symmetry

  9. Line Reflections Draw all lines of symmetry: • Rectangle • Square • Equilateral Triangle

  10. Line Reflections Draw all lines of symmetry on the following words: • MOM • DAD • HIKED • CHECK • RADAR • TOOT DAD MOM No lines of symmetry HIKED CHECK RADAR TOOT No lines of symmetry

  11. Line Reflections Under a line reflection: • distance is preserved • angle measure is preserved • midpoint is preserved • collinearity is preserved rk= “the reflection across line k”

  12. Line Reflections in the Coordinate Plane Reflections in the y-axis Plot: A (1,2) B (3,4) C (1,5) Under a reflection in the y-axis: (x,y)  _____ y-axis

  13. Line Reflections in the Coordinate Plane Reflections in the x-axis Plot: A (1,2) B (3,4) C (1,5) Under a reflection in the x-axis: (x,y)  _____ x-axis

  14. Line Reflections in the Coordinate Plane Reflections in the line y=x Plot: A (1,2) B (3,4) C (1,5) Under a reflection in the line y=x: (x,y)  _____ y=x

  15. Pop Quiz … just kidding

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