Решение задач. №591 (а)

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. 591 (). : =8, =17 . ,. , , : ) =8, =17. . . . . 591 (). : =21, =20 , . - PowerPoint PPT Presentation

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  • .591 (). :=8, =17 .

    ,

    , , :) =8, =17.

  • .591 () :=21, =20,

    , , :)=21, =20;

  • .600.

    ABCD, =60 , =12 , = D = 600 . (=900) :

    =DCE . HBCE = 60 .AD= 2AH + HE= 60 + : 73,86 .

    60 . , 600, 12 ?

    DEH73, 86 ().

  • .

    DH D , =300. , : =300.

    :

    (=) =300. , , AD =20 (D , D).

  • D D =12 , D = 47050/. , D .

  • SABCD= ABBD. ABD:

    47050/

    .. . SABCD= ABBD= 8,98,06= 71,734 (2) : SABCD = 71,734 (2).

    D