Final answer:
To round 3.57 cm to the nearest tenth, you round up the tenths place because the hundredths place is 7. Therefore, the rounded figure is 3.6 cm. so, option A is the correct answer.
Step-by-step explanation:
To round 3.57 cm to the nearest tenth of a centimeter, you consider the hundredths place. If the hundredths place is 5 or above, you round up the tenths place; if it is below 5, you keep the tenths place as it is. In this case, the hundredths place is 7, which is more than 5, so we round up from 3.5 to 3.6 cm.
Centimeters (cm) are the unit used, which is a common measurement of length smaller than inches. When using a ruler without millimeter markings, the tenths place is estimated. Given that 3.57 cm definitely has a tenths digit of 5 with a hundredths digit more than 5, the best answer is 3.6 cm which corresponds to option A).