We are given the following quantity:
We are asked to determine the number of significant figures. The number of significant figures is the number of digits that are relevant for measurement. This depends on the resolution of the measuring device. In this case, we are given a measurement in centimeters with 3 decimal digits, therefore, the resolution of the measuring device should be up to 0.001 cm. Therefore the number of significant figures is 7, and those figures are:
