## Elementary Geometry for College Students (6th Edition)

PROOF Statements | Reasons 1.) $\overline{AD}$ $\bot$ $\overline{DC}$ and $\overline{BC}$ $\bot$ $\overline{DC}$ | 1.) Given 2.) $\overline{AD}$ $\parallel$ $\overline{BC}$ | 2.) If two lines are each $\bot$ to a third line, then these lines are $\parallel$ to each other
PROOF Statements | Reasons 1.) $\overline{AD}$ $\bot$ $\overline{DC}$ and $\overline{BC}$ $\bot$ $\overline{DC}$ | 1.) Given 2.) $\overline{AD}$ $\parallel$ $\overline{BC}$ | 2.) If two lines are each $\bot$ to a third line, then these lines are $\parallel$ to each other