how many significant figures are in this length? 21.00 cm

how many significant figures are in this length? 21.00 cm
Answer
Answer:
4
Explanation:
Step1: Identify non - zero digits
2 and 1 are non - zero digits, count as 2 significant figures.
Step2: Consider trailing zeros after decimal
The two zeros after the decimal point are significant. So in total, there are 4 significant figures.