To find the length of AB in the enlarged picture, you can multiply the original length by the scale factor.
The original length of AB is 5 inches, and the scale factor for the enlargement is 1:5. This means that every unit in the original picture will be multiplied by 5 in the enlarged picture.
So, you calculate the length in the enlarged picture as follows:
\[ \text{Length in enlarged picture} = \text{Original length} \times \text{Scale factor} \] \[ \text{Length in enlarged picture} = 5 \text{ inches} \times 5 = 25 \text{ inches} \]
Therefore, the length of AB in the enlarged picture would be 25 inches.