Toán hình học lớp 8

T

tyn_nguyket

toán

Ta có: $\hat{A}-\hat{D}=20^o$
Mà AB // CD \Rightarrow $\hat{A}+\hat{D}=180^o$
\Rightarrow $\hat{A}= 100^o$, $\hat{D}=80^o$
Lại có: $\hat{B} = 2\hat{C}$
Mà $\hat{B}+\hat{C}=180^o$
\Rightarrow $\hat{B}= 120^o$, $\hat{C}=60^o$
 
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