Question

Câu bé thì như nào ạ???

Answer 1

ACD =65 

C1= 115

Answer 2

a) Ta có: a⊥AB,b⊥AB

=> a//b

b) Ta có: a//b

\(\Rightarrow\widehat{ACD}=\widehat{D}=65^0\)(so le trong)

Ta có: \(\widehat{ACD}+\widehat{C_1}=180^0\)(kề bù)

\(\Rightarrow\widehat{C_1}=180^0-\widehat{ACD}=180^0-65^0=115^0\)