What does CBA mean?
CBA, the full name of which is the mainland Basketball Association, is the Secondary Development League of NBA. Most of the NBA's short-term workers and laid-off players go to work in this league
As shown in the figure, in △ ABC, ∠ C = 60 °, ad ⊥ BC in D, be ⊥ AC in E
It is proved that: ∵ in △ ABC, ∵ C = 60 °, ad ⊥ BC in D, be ⊥ AC in E, ∵ CAD = ∵ CBE, ∵ Ce: CB = CD: CA = 1:2, ∵ C is the common angle, ∵ CDE ∽ CBA
As shown in the figure, in △ ABC, ad ⊥ BC is at point D, be ⊥ AC is at point E, to prove △ CDR ∽ CBA
It's a triangle CDE, wrong number, and the picture can't be transferred
∵AD⊥BC,BE⊥AC
∴∠ADC=∠BEC=90°
∠C=∠C
∴△ADC∽△BEC
∴AC/BC=CD/CE
That is AC / CD = BC / CE
∵∠ACB=∠ECD
∴△CDE∽△CBA