Đáp án:
$\text{$\widehat{AOC}$ = $100^o$}$
$\text{$\widehat{AOD}$ = $80^0$}$
$\text{$\widehat{COB}$ = $80^0$}$
$\text{$\widehat{DOA}$ = $100^o$}$
Giải thích các bước giải:
$\text{Giải:}$
$\text{Ta có : }$
$\text{$\widehat{AOC}$ + $\widehat{AOD}$ = $180^o$ (2 góc kề bù)}$
$\text{$\widehat{AOC}$ = $180^o$ + $20^o$ : 2 = $100^o$$}$
$\text{⇒ $\widehat{AOD}$ = $180^o$ - $\widehat{AOC}$}$
$\text{⇒ $\widehat{AOD}$ = $180^o$ - $100^o$ = $80^o$}$
$\text{Ta có : }$
$\text{$\widehat{COB}$ = $\widehat{AOD}$ = $80^0$(2 góc đối đỉnh)}$
$\text{$\widehat{DOA}$ = $\widehat{AOC}$ = $100^0$(2 góc đối đỉnh)}$
$\text{Vậy :}$
$\text{$\widehat{AOC}$ = $100^o$}$
$\text{$\widehat{AOD}$ = $80^0$}$
$\text{$\widehat{COB}$ = $80^0$}$
$\text{$\widehat{DOA}$ = $100^o$}$
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