Final answer:
The query is regarding the rounding of a radius to significant figures in mathematics. The radius closest to the digit would either be 4 or 5, depending on which digit was rounded given the context of two significant figures for area as 4.5 m².
Step-by-step explanation:
The question appears to relate to the topic of significant figures and rounding numbers in mathematics. When looking at the radius given as 4 1 5 3, if we consider the area to be 4.5 m² due to two significant figures, it suggests that the radius has been rounded to two significant figures. According to the rules of rounding:
- If the digit to be dropped is 5 or greater, the previous digit is increased by one.
- If the digit to be dropped is less than 5, the previous digit remains unchanged.
- All nonzero digits are considered significant. Zeros between nonzero digits are also significant, but leading zeros are not.
Therefore, if the radius is rounded to the nearest digit with respect to significant figures, depending on the context of the surrounding values, either the digit 4 or 5 would be the radius' closest digit.