Observing Properties of Dilations
The diagram shows a dilation of line AB
about the origin O. Determine the scale
factor of the dilation by following these
steps.
3. Measure these lengths:
AB = 2.2
units
A'B' = 3.3
units
4. Calculate this ratio: OA'/OA= 1.5
✓5. Calculate this ratio: OB/OB = 1.5
6. Calculate this ratio: A'B' / AB = 15
2
☐ B
о
B
1346 8 10 12
A A
Correct! The scale factor for this dilation is
1.5.
ANSWERS