Question

is $overline{de}$ congruent to $overline{cd}$?
c d e
-86 -85 -84 -83 -82 -81 -80
yes no

Explanation:

Step1: Calculate length of CD

$CD=\vert - 82-(-83)\vert=\vert - 82 + 83\vert = 1$

Step2: Calculate length of DE

$DE=\vert - 81-(-82)\vert=\vert - 81 + 82\vert = 1$

Step3: Compare lengths

Since $CD = 1$ and $DE = 1$, $CD$ and $DE$ have the same length. Congruent line - segments have the same length.

Answer:

yes