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Parallel and Intersecting Lines

Checkpoint: square corners and bends

Four questions on the last three ideas. Feedback comes right away. Retry whenever you want.

One angle at a crossing is 90°. How many of the four angles are 90°?

A set square slides along a ruler and draws p and q. Each is drawn along the square edge. What is true of p and q?

A path bends at O between two parallels. Its ends lie on the same side of O. The marked end angles are 52° and 63°. What is the bend?

A path bends between two parallel lines. Its ends lie on the same side of the bend. The bend is 140°. One marked end angle is 85°. What is the other?

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This track

  1. 0 Start here
  2. 1 Cross once, or never cross
  3. 2 What parallel really means
  4. 3 The four angles at a crossing
  5. 4 Angles that fill a straight line
  6. 5 One line laid across two
  7. 6 Only when the lines are parallel
  8. 7 Finding an angle nobody measured
  9. 8 Square corners: perpendicular lines
  10. 9 Parallels from square corners
  11. 10 A bend between two parallels
  12. 11 Checkpoint: square corners and bends
  13. 12 The big picture
  14. 13 Track quiz

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