Activity 1: Proof

A busy, two-lane split highway crosses another busy split highway. The northbound lanes are divided from the southbound lanes by a borrow pit. To maintain a direct line of traffic flow, the lines of traffic must be parallel. To verify this, you need to prove that in the following diagram the lines of traffic are parallel.

Given:

?CBD??BDH;m?ABJ+m?IHG=180?

Prove:

AF?

is parallel toLG?

\f\f