Length of Parallel Segment in Triangle

Consider triangle ABC where angle A measures $60^{\circ}$ and angle B measures $80^{\circ}$. A line segment DE is drawn parallel to side BC of triangle ABC, intersecting sides AB and AC at points D and E, respectively. If the length of side AB is 10 units, what is the length of segment DE?

Use the properties of similar triangles to determine the length. Recall that corresponding sides of similar triangles are in proportion.