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Trịnh Việt Dũng
15 tháng 6 2022 lúc 20:31

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7.2 huỳnh anh
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Nguyễn Lê Phước Thịnh
27 tháng 7 2023 lúc 13:53

a: Xét ΔOAM vuông tại A và ΔOBM vuông tại B có

OM chung

góc AOM=góc BOM

=>ΔOAM=ΔOBM

b: ΔOAM=ΔOBM

=>OA=OB và MA=MB

=>ΔOAB cân tại O

c: OA=OB

MA=MB

=>OM là trung trực của BA

=>Oz vuông góc BA

Nguyễn Ánh Tuyết
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Le Trinh
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Le Trinh
9 tháng 5 2019 lúc 23:22

còn 1 câu nữa là so sánh IC và IA

ngoc dang
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Nguyễn Châm Anh
23 tháng 2 2018 lúc 21:47

a, Xét \(\Delta AOC\)và \(\Delta BOD\) có:

     \(\widehat{OAC=\widehat{OBD}}=90\)

      Chung\(\widehat{AOB}\)

      OA=OB

=> \(\Delta OAC=\Delta OBD\left(g-c-g\right)\)

b,\(\widehat{OAB}+\widehat{IAB}=90\)

\(\widehat{OBA}+\widehat{IBA}=90\)

Mà \(\widehat{OAB}=\widehat{OBA}\left(\Delta OABc\text{â}n\right)\)

=> \(\widehat{IAB}=\widehat{IBA}\)

=> \(\Delta IAB\) cân tại I

c,\(\Delta IBC\) vuông tại B=> IB<IC

Mà IA=IB => IA<IC

d,\(\widehat{IAB}=\widehat{AOI}\)(cùng phụ \(\widehat{OAB}\))

\(\widehat{AOI}=\frac{1}{2}\widehat{AOB}\)

=> \(\widehat{IAB}=\frac{1}{2}\widehat{AOB}\)

Le Trinh
9 tháng 5 2019 lúc 22:58

tui chỉ giải được a b thui c d bn giải được thì giúp tui ngay nhoa mà nếu chưa giải đc a b thì nói để tui giúp

lâmthuỳtrang
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l҉o҉n҉g҉ d҉z҉
2 tháng 5 2020 lúc 16:35

Đề của bạn còn sai, thiếu nhiều chỗ lắm 

Cho góc nhọn xOy . Trên Ox lấy điểm A, trên Oy lấy điểm B sao cho OA = OB. Từ A kẻ đường thẳng vuông góc với Oy cắt Oy ở E , từ B kẻ đường thẳng vuông góc với Ox cắt Ox tại F . AE và BF cắt nhau tại I

Đến đây bạn có thể tự làm được rồi 

#Chúc bạn may mắn 

Khách vãng lai đã xóa
Thành Nguyễn
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Irene
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Phạm Anh Minh
29 tháng 1 2019 lúc 18:59

có 3 tam giác thì lấy 3 tam giác đó ghép lại

Irene
29 tháng 1 2019 lúc 19:00

bn vẽ hình ra đi

Nguyễn Trúc
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Nguyễn Lê Phước Thịnh
6 tháng 1 2022 lúc 14:11

a: XétΔAOB và ΔKOC có

OA=OK

\(\widehat{AOB}=\widehat{KOC}\)

OB=OC

Do đó: ΔAOB=ΔKOC

b: Xét ΔAOM vuông tại A và ΔKON vuông tại N có 

OA=OK

\(\widehat{AOM}=\widehat{KON}\)

Do đó: ΔAOM=ΔKON

Suy ra; MO=NO

Hồ Thị Khánh Hòa
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