Cho tam giác ABC. Ta có:

Cơ bản

Cho tam giác ABC. Ta có:

4 câu trả lời

A.
$\widehat{A}+\widehat{B}+\widehat{C}=180$
B.
$\widehat{A}+\widehat{B}+\widehat{C}=108$
C.
$\widehat{A}+\widehat{B}+\widehat{C}<180$
D.
$\widehat{A}+\widehat{B}+\widehat{C}>180$