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Warm Up Draw the diagram and name each figure.

PQ. QP,. PQ,. QR. QP,. QR. Warm Up Draw the diagram and name each figure. P. Q. R. 1. three points. P, Q, R. 2. a line. plane PQR. 3. a plane. 4. three rays. 5. two segments. Vocabulary. parallel lines perpendicular lines skew lines. WX || YZ.

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Warm Up Draw the diagram and name each figure.

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  1. PQ QP, PQ, QR QP, QR Warm Up Draw the diagram and name each figure. P Q R 1. three points P, Q, R 2. a line plane PQR 3. a plane 4. three rays 5. two segments

  2. Vocabulary parallel lines perpendicular lines skew lines

  3. WX || YZ. Parallel lines are lines in the same plane that never intersect. Line WX is parallel to line YZ.

  4. Reading Math The red arrows on lines WX and YZ show that the lines are parallel.

  5. RS | TU. __ Perpendicular lines intersect to form 90o angles, or right angles. Line RS is perpendicular to line TU.

  6. AB and ML are skew. Skew lines are lines that lie in different planes. They are neither parallel nor intersecting. Line AB and line ML are skew lines.

  7. B D C AD || BC AD || BC Partner Work #1 Identify two lines that have the given relationship. A. parallel lines A The lines are in the same plane and do not intersect. E

  8. B D C CB | CE __ Partner Work #2 Identify two lines that have the given relationship. B. perpendicular lines A The lines intersect to form 90o angles. E

  9. Caution! Two lines may be perpendicular even though they do not appear to be perpendicular. Use the markings on the drawings and read the problem carefully to determine which lines are perpendicular.

  10. A B D C E AD and CE Partner Work #3 Identify two lines that have the given relationship. C. skew lines The lines lie in different planes. They are neither parallel nor intersecting.

  11. NP PS Independent Work #1 Identify two lines that have the given relationship. A. perpendicular lines The lines insect to form 90o angles.

  12. NP and QR Independent Work #2 Identify two lines that have the given relationship. B. skew lines The lines lie in different planes. They are neither parallel nor intersecting.

  13. RS and QT Independent Work #3 Identify two lines that have the given relationship. C. parallel lines The lines are in the same plane and do not intersect.

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