Question

các bạn giúp mk với 

Answer 1

6:

1: \(AD\perp AB;BC\perp AB\)

=>AD//BC

2:

AD//BC

=>\(\widehat{C_1}+\widehat{ADC}=180^0\)(trong cùng phía)

=>\(\widehat{C_1}=130^0\)

3:

d là trung trực của AB

=>\(d\perp AB\)

=>d//AD//BC

9:

1: Hai góc so le trong là \(\widehat{xOA};\widehat{BAO}\)

2: BA//Ox

=>\(\widehat{xOA}=\widehat{BAO}\)

mà \(\widehat{xOA}=\widehat{BOA}\)

nên \(\widehat{BAO}=\widehat{BOA}\)

8:

1: BA//Ox

=>\(\widehat{yBA}=\widehat{xOy}\)(hai góc đồng vị)

=>\(\widehat{yBA}=30^0\)

\(\widehat{ABO}+\widehat{yBA}=180^0\)(kề bù)

=>\(\widehat{ABO}=180^0-30^0=150^0\)

2: AC//Oy

=>\(\widehat{xCA}=\widehat{xOy}\)(hai góc đồng vị)

=>\(\widehat{xCA}=30^0\)

\(\widehat{xCA}+\widehat{ACO}=180^0\)(kề bù)

=>\(\widehat{ACO}=180^0-30^0=150^0\)