Lesson 3 of 16
A bigger copy is a different figure
Show on a big screenA drawing is copied at 140%. That means every length becomes 1.4 times as long. Put one drawing on top of the other. They do not match.
Slide the size. Only one size gives a twin.
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Step 1 of 3
- The small triangle.
- A 140% copy, from the same corner.
- The far corners miss. Corners agree, sides do not.
Congruent needs the sides too
Every side and every corner must match. A bigger copy keeps every corner. Its sides are longer. So it is not congruent.
Example: sides of 40, 50 and 60 mm. Multiply each side by 1.4. 40 × 1.4 = 56 mm. 50 × 1.4 = 70 mm. 60 × 1.4 = 84 mm.
| The copy | Corners | Sides | Congruent? |
|---|---|---|---|
| Same size, moved | Match | Match | Yes |
| Turned over | Match | Match | Yes |
| Blown up to 140% | Match | Every one longer | No |
Try the lab to finish this lesson.