### Home > INT2 > Chapter 12 > Lesson 12.2.4 > Problem12-135

12-135.

The length of chord $\overline{AB}$ in $⊙D$ is $9$ mm. If $m\overarc{ A B }=32º$, what is the length of $\overarc{ A B }$? Draw a diagram.

Notice the relationship between $AD$ and $DB$.

Remember that the sum of the interior angles of a triangle is always $180°$.

Rely on your trig ratios to solve for the length of the radius.

$9.1$ mm