Points e, d, and h are the midpoints of triangle tuv. uv=80, tv=100, and hd=80. find tu.

Triangle HVD is similar to triangle TVU. ratio of corresponding sides are equal

Since D is the midpoint of VU, VD=40

40(TU)=80(80)

Skew lines(segments) are lines(segments) in 3 dimensions that do not intersect the given segment and are not parallel to it.  ae, bf, eg, and fh are your skew segments.  i hope that : )