Question

cho tam giac ABC can tai A va tam giac DEF can tai D biet goc A bang 80 do goc E bang 50 do thi

 

Answer 1

tam giac ABC can tai A

=>\(\widehat{B}=\widehat{C}=\dfrac{180-\widehat{A}}{2}=\dfrac{180-80}{2}=50^0\)

tam giac DEF can tai D

\(=>\widehat{D}=180-\left(\widehat{E}+\widehat{F}\right)\)

mà E = F =50^o( do tam giac DEF can tai D_

\(=>\widehat{D}=180-\left(50+50\right)=80^o\)

=>\(\text{ ΔABC∼ΔDEF}\)

Answer 2

\(\widehat{D}=180^0-2\cdot50^0=80^0\)

=>ΔABC\(\sim\)ΔDEF

Answer 3

thiếu đề thì làm kiểu j đc hả bn