Estimate the size of a penny in cm
The penny is a common coin in the United States, which has a diameter of about 19.05 mm or 1.905 cm. It's worth noting that coin sizes from other countries might differ.
Complete the following task based on the instruction and optional input provided.### Instruction:
Estimate the size of a penny in cm

### Output:
The penny is a common coin in the United States, which has a diameter of about 19.05 mm or 1.905 cm. It's worth noting that coin sizes from other countries might differ.