Hint to puzzle 132: Triangular angle
Several approaches to this problem are possible. Extend CB to O, so that AO
CO. Then:
- Consider the ratios CO/AO, DO/AO, and BO/AO.
or - Show that
ABC is similar to DBA.
Several approaches to this problem are possible. Extend CB to O, so that AOCO. Then:
ABC is similar to DBA.