To determine which of the measurements has three significant digits, we can analyze each option based on the rules of significant figures:
- 134 meters - This has three significant digits (1, 3, and 4).
- 56.09 inches - This has four significant digits (5, 6, 0, and 9).
- 0.52 centimeters - This has two significant digits (5 and 2; the leading zero is not significant).
- 8009 miles - This has four significant digits (8, 0, 0, and 9).
Based on this analysis, the measurement with three significant digits is 134 meters.