Lesson 4 of 16
One line, one corner
Show on a big screenHold up two threads, one straight and one slanted. Pull both tight. They are the same length.
Look at each pair. Say yes or no.
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The test on one thing
A line segment is part of a line, with two end points. An angle is two arms that start at one point. An arm is a straight line.
- Two line segments are congruent when their lengths are equal.
- Two angles are congruent when their sizes in degrees are equal.
Tilt is how much a line slants. It does not matter. Turning a segment does not change its length. An angle's size is the turn between its arms. It is not how long the arms are drawn.
| Figure | What must match |
|---|---|
| Line segment | Its length |
| Angle | Its size in degrees |
| Circle | Its radius |
| Rectangle | Its length and its width |
Try the lab to finish this lesson.