Toán Lớp 7: Cho tam giác ABC có A =40°, B=60°. Tính c
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Toán Lớp 7: Cho tam giác ABC có A =40°, B=60°. Tính c
Comments ( 2 )
\text{@Nem BĐHH}
Xét ΔABC có : \hat{A}+\hat{B}+\hat{C}=180^o
Mà \hat{A}=40^o ; \hat{B}=60^o
⇒\hat{C}=180^o-40^o-60^o=80^o
Vậy \hat{C}=80^o
ΔABC có: $\hat{A}+\hat{B}+\hat{C}=180^o$
$→40^o+60^o+\hat{C}=180^o$
$→100^o+\hat{C}=180^o$
$→\hat{C}=180^o-100^o$
$→\hat{C}=80^o$