В квадрате диагональ делит угол пополам

В квадрате диагональ делит угол пополам

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= D;
BC = CD;

AB = AC = CD = AD

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ABO = = COD = AOD
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AB=BC=CD=AD ( ).
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AO=BO=CO=DO — .


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: ABCD —
( = = = D, AB=BC=CD=AD)

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= ACD

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— ADC ( ).
= D =90, ADC- .
AB =BC =CD = AD ( ).
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: = D, = D

: : ABCD — .

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ABO = = COD = AOD
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AB=BC=CD=AD ( ).
1= 2 = 3 = 4 = 5 = 6 = 7 = 8
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1).AO=BO=CO=DO — .
2) AC = AO = OC
&nbsp&nbsp&nbsp&nbsp BD = BO = OD, AC = BD , .
3). COD = AOD =90,
( , )
BD_|_AC.

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Источник: www.dod.eduworks.ru


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