3.5 cm x 4.5 cm at 100 dpi is equivalent to 138 x 177 pixels.
Explanation:
The given dimensions are 3.5 cm x 4.5 cm
Since, 1 inch is equal to 2.54 cm
3.5 cm x 4.5 cm is equal to 1.38 in x 1.77 in
Now, the given dpi (dots per inch or pixels per inches) is 100 that means there are 100 dots or pixels in 1 inch
Hence, the dimensions in pixels will be 1.38 x 100 x 1.77 x 100 pixels =138 x 177 pixels.