Question

measure the length of side \\(\overline{st}\\)
move the ruler with the blue dot.
rotate or lengthen the ruler with the green dot.
you may shift or zoom the canvas using your mouse.
estimate the length of \\(\overline{st}\\): \\(\square\\) cm

Explanation:

Step1: Align ruler with $\overline{ST}$

Position ruler endpoints at S and T.

Step2: Measure straight-line distance

Read ruler value for $\overline{ST}$.

Answer:

5 cm (estimated; actual measurement may vary slightly based on precise alignment)