Rules: Polite Musings from a Timid Observer, 2005 (ISBN 1-59486-295-8) D.C. Cab (1983) (aka Street Fleet) .... Bob Rags to Riches (1986) (aka Foley and
{\displaystyle \angle CAB=\angle CDE} (平行線的同位角) ∠ C B A = ∠ C E D {\displaystyle \angle CBA=\angle CED} (平行線的同位角) 所以 Δ A B C ∼ Δ D E C {\displaystyle \Delta