Bai 20:Ve doan thang AB dai 2cm va doan thang BC dai 3cm roi ve duong trung truc cua moi doan thang ay (Ve hinh trong hai truong truong hop:ba diem A,B,C khong thang hang,ba diem A,B,C thang hang)
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Trên cung mot hinh ve
a,3 Điện khong thang hang A,B,C
b,Ve doan thang AB , duong thang BC
c, Tia AC va tia Ay la tia doi cua tia AC
d,Ve tia Cx cat doan thang AB tai trung diem M cua AB
cho 3 diem A,B,C, khong thang hang,ve doan thang BC
ve diem M la trung diem cua doan thang BC
ve tia BA,duong thang AC
ve duong thang AD sao cho M nam giua A va D
Ve hinh theo các cách diem dat sau : cho 3 diem A, B,C không thang hang . Ve tia AB ,doan thang AC, duong thang BC . Ve tia Bx cat doan AC tai D cho D la trung diem cua doan thang Ac
cho 3 diem A,B,C khong thang hang
a)Ve duong thang AB, doan thang BC,tia AC.Lay dien M tren duong thang AB sao cho B,M nam cung phia so voi diem A
b)Ve tia Ax la tia doi cua tia AC.Lay diem N sao cho A la trung diem cua doan CN(ve tren cung 1 hinh)
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cho ba diem a,b,c khong thang hang ve duong thang ab tia ac doan thang bc diem m nam giua b va c
tren tia Ax lay hai diem B va C sao cho AB2cm,AC8cma/ tinh do dai doan thang BCb/ goi M la trung diem cua doan thang BC tinh do dai BMc/ ve tia Ay la tia doi cua tia Ax tren tia Ay lay diem D sao cho AD2cm chung to rang diem A la trung diem cua doan thang BDgiup minh ve hinh cho minh nhanh len minh dang gap ve ca hinh cho to nua nhanh to like
Đọc tiếp
tren tia Ax lay hai diem B va C sao cho AB=2cm,AC=8cm
a/ tinh do dai doan thang BC
b/ goi M la trung diem cua doan thang BC tinh do dai BM
c/ ve tia Ay la tia doi cua tia Ax tren tia Ay lay diem D sao cho AD=2cm
chung to rang diem A la trung diem cua doan thang BD
giup minh ve hinh cho minh nhanh len minh dang gap ve ca hinh cho to nua nhanh to like
Ban tu ve hinh,mk ko biet cach ve
a/Diem B la diem nam giua A va C vi AB<AC(2cm<8cm)
Ta co:AB+BC=AC
2 +BC= 8
BC=8-2=6 cm
b/Vi M la trung diem cua doan thang BC nen BM=CM=BC:2=6:2=3 cm
c/Diem A la diem nam giua B va D vi B va D la hai tia doi nhau chung goc A
Diem A la trung diem cua doan thang BD vi:
+A nam giua D va B
+AD=AB=2 cm
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Ve doan thang AB dai 6cm co trung diem I ve duong trung truc cua AB roi ve duong trung truc cua BI
ve hinh theo cach dien dat sau:
-cho 3 diem A,B,C khong thang hang
-ve hai tia ab,ac
-ve ay la tia doi cua tia ac
-lay i la trung diem cua doan thang bc
bai 1;cho 2 tia Ox vaOy khong doi nhau
a,ve duong thang aa' cat tia Ox va Oy lan luot tai A va B khac O.Ve diem M nam giua A va B.Ve tia OM.Ve tia ON la tia doi cua tia OM
b,chi ra nhung doan thang tren hinh
c,chi ra 3 diem thang hang tren hinh
bai 2;ve tia Ox.Ve tren tia Ox voi OA la 3cm;OB la 5cm;OC la 7cm
CMR diem B la trung diem doan thang AC