Question

use the ruler to measure the length of $overline{rs}$ to the nearest centimeter. not drawn to scale the length of $overline{rs}$ is centimeters.

Explanation:

Step1: Align the ruler

Align the 0 - mark of the ruler with point R.

Step2: Read the value

Read the value on the ruler where point S lies. Assume from the visual inspection of the ruler, point S is at the 20 - cm mark.

Answer:

20