giúp e vs ạ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

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giúp e vs ạ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
giup-e-vs-a-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

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Gerda 1 year 2020-11-06T00:25:23+00:00 1 Answers 63 views 0

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    2020-11-06T00:26:31+00:00

    a, $xA⊥m$
    $yB⊥m$
    $⇒xA//yB$

    b, Gọi góc $B$ cho sẵn độ là $B1$
    $B1+B2=180^o$($2$ góc kề bù)

    $⇒76^o+B2=180^o$
    $⇒B2=180^o-76^o=104^o$
    $xA//yB$
    $⇒A3=B1=76^o$(so le trong)

    $A3=A1=76^o$($2$ góc đối đỉnh)

    $xA//yB$

    $⇒B2=A4=104^o$(so le trong)

    $A4=A2=104^o$($2$ góc đối đỉnh)

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