Question

measure circles
in the length unit exercise, what tool did you use to measure the circles?
multiple choice
triple beam balance
thermometer
none of the answer choices are correct.
metric ruler
protractor

Explanation:

To measure circles (e.g., diameter, circumference related to length), a metric ruler is used for linear length measurements. A triple beam balance measures mass, a thermometer measures temperature, and a protractor measures angles—none of these are for measuring circle - related lengths except the metric ruler.

Answer:

D. metric ruler