What does CBA mean?

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