Bài 2:
Xét tứ giác MNPQ, ta có:
\(\widehat{M}+\widehat{N}+\widehat{P}+\widehat{Q}\)=3600
hay 4x+5x+2x+x=3600
=>12x=3600
=>x=300
Suy ra:
. \(\widehat{M}\)=4.300=1200
.\(\widehat{N}\)=5.300=1500
.\(\widehat{P}\)=2.300=600
.\(\widehat{Q}\)=300
Vậy\(\widehat{M}\)=1200;\(\widehat{N}\)=1500;\(\widehat{P}\)=600;\(\widehat{Q}\)=300
Bài 1:Xét tứ giác ABCD, có:
^A+^B+^C+^D=3600
hay 900+700+^C+900=3600
=>2500+^C=3600
=>^C=3600-2500
=>^C=1100
Vậy ^C=1100